Probably been covered but I finally have it working (yay!) but only in the pop out window. The GTN 750 area of the panel in my Carenado F33A is just a black screen. Here's my ini for that plane :

 

[GTN]
; comma separated list of gauges
gauges = GTN_750_1

[GTN_750_1]
; comma separated list of render targets.
drawto = WINDOW, PANELS
; is the master device if true.
MasterDevice = true
; connects GPS to copilot side if true.
CopilotSide = false
; selects COM/NAV Radios '1' or '2'.
RadiosPair = 1
; uses computer time if true, simulator time otherwise.
ComputerTime = false
; reduce screen update rate by half.
ReduceRate = true
; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Display = -99
; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Buttons = -100
; connects GPS to Autopilot if true.
LinkOto = true
; connects GPS to HSI if true.
LinkHsi = true
; connects GPS to HSI course motor if true.
LinkCrs = false
; connects GPS to OBS input if true (LinkHsi/OBS or AutoNavSource/OBS).
LinkObs = false
; connects GPS to VOR if true.
LinkVor = false
; connects CDI key to NAV/GPS switch if true.
AutoNavGps = true
; enables automatic GPS/VLOC selection.
AutoSelect = true
; selects VLOC NAV '1' or '2'. '0' selects same source as 'RadiosPair'.
AutoNavSource = 0
; sets device power source: 
; ALWAYS_ON,AVIONICS_BUS,MAIN_BATTERY,BUS_1,BUS_2,BUS_3,BUS_4,BUS_5,BUS_6
PowerSource = AVIONICS_BUS
; connects GPS to Shadin Air Data computer if true.
UseAirData = true
; connects GPS to Shadin Fuel Data computer if true.
UseFuelData = true
; connects GPS to Audio Panel if true.
UseAudioPanel = true
; connects GPS to Transponder if true.
UseTransponder = true
; connects GPS to RYAN 9900BX if true.
UseRyanTcad = true
; sets TCAD sound alerts volume in percent: 0 to 100.
RyanTcadVolume = 50
; sets TCAD maximum number of targets to X-Plane AI Traffic Count.
UseTcadAiCount = true
; enable device failures if true.
UseFailures = false
; uses Simulator GPS commands if true.
UseSimGpsCmds = false
; updates Simulator GPS flight plan if true.
LinkSimGps = false
; saves the active route as a Simulator flight plan if true.
AutoSavePln = false
; sets transponder VFR code (octal default: #1200).
VFRcode = #1200
; sets fuel type: AVGAS,JETA,JETB,DIESEL
FuelType = AVGAS
; sets ownship icon type: 
; AUTO,LOW_WING,HIGH_WING,KIT_PLANE,TURBOPROP,TWIN_ENGINE,SINGLE_JET,BUSINESS_JET,2BLADES,3BLADES,4BLADES,ARROW
OwnshipIcon = AUTO
; aviation db: 0: nav_db2_grm, 1: nav_db2, 2: nav_heli_db2_grmn, 3: nav_heli_db2
NavDbType = 0
; sets TAWS type: TERR,TAWS_B,TAWS_A
TawsMode = TAWS_A
; sets TAWS surface: HARD,HARD_SOFT,WATER,ANY
TawsSurface = HARD_SOFT
; TAWS minimum runway length (feet)
TawsMinLength = 40
; TAWS approach air speed (knots), or -1 (auto detect Vref: 83)
TawsApprSpeed = 83
; TAWS maximum flap extension speed (knots) or -1 (auto detect Vfe: 154)
TawsFlapSpeed = 154
; TAWS maximum gear extension speed (knots) or -1 (auto detect Vle: 154)
TawsGearSpeed = 154
; sets voice type: MALE,FEMALE
VoicePref = MALE
; sets master sound volume in percent: 0 to 100.
MasterVolume = 100
; mute sound when simulator window looses focus if false.
NoAudioFocus = false
; sets trainer process CPU: 1 to 32 (0: last core, -1: automatic).
CpuAffinity = -1
; use transponder VFR code: USE_CODE,VFR_US,VFR_EUR
VFRmode = VFR_US
; HSI lateral deviation scale factor.
CdiScale = 1
; HSI vertical deviation scale factor.
GsiScale = 1
; main: CDI Key
AFMS.cdi_key = 
; main: Selected Course for GPS
AFMS.sel_crs_gps = 
; main: Selected Course for VLOC
AFMS.sel_crs_vloc = 
; main: V-Flag State (1: declutter
AFMS.v_flag_declutter = 
; main: GPS Selected (0: prompt, 1: auto)
AFMS.gps_selected = 1
; main: Airspace Labels
AFMS.airspace_labels = 
; nav : Mark On Target
AFMS.mark_on_target = 
; nav : RF Procedure Legs
AFMS.rf_procedure_legs = 
; vnav: Vertical Navigation Type (0: VCALC, 1: VNAV)
AFMS.vnav_enabled = 
; vnav: Transition To Approach
AFMS.vnav_trans_to_appr = 
; vnav: VDI Scale (ft)
AFMS.vnav_vdi_scale_factor = 
; vnav: Transition Altitude (180 = FL180)
AFMS.vnav_trans_altitude = 

[GTN_750_1.WINDOW]
; display window if true.
visible = true
; show screen only gauge if true.
nobezel = false
; display type: WINDOW,PANEL2D,PANEL3D,PANELS
frame.type = WINDOW
; display position and dimension (left,top,width,height)
frame.rect = 10,800,830,790
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; enable mouse clickspots if true, disable if false (use SHIFT to override)
usemouse = true 
; left mouse button on the screen toggles popup window if true (requires SHIFT+left mouse button).
popleft = false
; right mouse button on the screen toggles popup window if true (requires XP11.1).
popright = true 
; VR mode position and dimension (left,top,width,height) (requires XP11.20)
vrmode.rect = 0,790,830,790
; display as popout window if true (requires XP11.1).
undocked = false
; display mouse tooltips if true.
tooltips = false
; freeze display position if true.
locked = false

[GTN_750_1.PANELS]
; display window if true.
visible = true
; show screen only gauge if true.
nobezel = true
; display type: WINDOW,PANEL2D,PANEL3D,PANELS
frame.type = PANELS
; display position and dimension (left,top,width,height)
frame.rect = 0,0,0,0
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; enable mouse clickspots if true, disable if false (use SHIFT to override)
usemouse = true
; left mouse button on the screen toggles popup window if true (requires SHIFT+left mouse button).
popleft = false
; right mouse button on the screen toggles popup window if true (requires XP11.1).
popright = true

[GTN_750_2]
; comma separated list of render targets.
drawto = WINDOW, PANELS
; is the master device if true.
MasterDevice = false
; connects GPS to copilot side if true.
CopilotSide = true
; selects COM/NAV Radios '1' or '2'.
RadiosPair = 2
; uses computer time if true, simulator time otherwise.
ComputerTime = false
; reduce screen update rate by half.
ReduceRate = false
; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Display = -100
; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Buttons = -75
; connects GPS to Autopilot if true.
LinkOto = true
; connects GPS to HSI if true.
LinkHsi = true
; connects GPS to HSI course motor if true.
LinkCrs = false
; connects GPS to OBS input if true (LinkHsi/OBS or AutoNavSource/OBS).
LinkObs = false
; connects GPS to VOR if true.
LinkVor = false
; connects CDI key to NAV/GPS switch if true.
AutoNavGps = true
; enables automatic GPS/VLOC selection.
AutoSelect = true
; selects VLOC NAV '1' or '2'. '0' selects same source as 'RadiosPair'.
AutoNavSource = 0
; sets device power source: 
; ALWAYS_ON,AVIONICS_BUS,MAIN_BATTERY,BUS_1,BUS_2,BUS_3,BUS_4,BUS_5,BUS_6
PowerSource = AVIONICS_BUS
; connects GPS to Shadin Air Data computer if true.
UseAirData = true
; connects GPS to Shadin Fuel Data computer if true.
UseFuelData = true
; connects GPS to Audio Panel if true.
UseAudioPanel = true
; connects GPS to Transponder if true.
UseTransponder = true
; connects GPS to RYAN 9900BX if true.
UseRyanTcad = true
; sets TCAD sound alerts volume in percent: 0 to 100.
RyanTcadVolume = 50
; sets TCAD maximum number of targets to X-Plane AI Traffic Count.
UseTcadAiCount = true
; enable device failures if true.
UseFailures = false
; uses Simulator GPS commands if true.
UseSimGpsCmds = false
; updates Simulator GPS flight plan if true.
LinkSimGps = false
; saves the active route as a Simulator flight plan if true.
AutoSavePln = false
; sets transponder VFR code (octal default: #1200).
VFRcode = #1200
; sets fuel type: AVGAS,JETA,JETB,DIESEL
FuelType = AVGAS
; sets ownship icon type: 
; AUTO,LOW_WING,HIGH_WING,KIT_PLANE,TURBOPROP,TWIN_ENGINE,SINGLE_JET,BUSINESS_JET,2BLADES,3BLADES,4BLADES,ARROW
OwnshipIcon = AUTO
; aviation db: 0: nav_db2_grm, 1: nav_db2, 2: nav_heli_db2_grmn, 3: nav_heli_db2
NavDbType = 1
; sets TAWS type: TERR,TAWS_B,TAWS_A
TawsMode = TERR
; sets TAWS surface: HARD,HARD_SOFT,WATER,ANY
TawsSurface = HARD_SOFT
; TAWS minimum runway length (feet)
TawsMinLength = 40
; TAWS approach air speed (knots), or -1 (auto detect Vref: 83)
TawsApprSpeed = -1
; TAWS maximum flap extension speed (knots) or -1 (auto detect Vfe: 154)
TawsFlapSpeed = -1
; TAWS maximum gear extension speed (knots) or -1 (auto detect Vle: 154)
TawsGearSpeed = -1
; sets voice type: MALE,FEMALE
VoicePref = MALE
; sets master sound volume in percent: 0 to 100.
MasterVolume = 100
; mute sound when simulator window looses focus if false.
NoAudioFocus = false
; sets trainer process CPU: 1 to 32 (0: last core, -1: automatic).
CpuAffinity = -1
; use transponder VFR code: USE_CODE,VFR_US,VFR_EUR
VFRmode = VFR_US
; HSI lateral deviation scale factor.
CdiScale = 1
; HSI vertical deviation scale factor.
GsiScale = 1
; main: CDI Key
AFMS.cdi_key = 
; main: Selected Course for GPS
AFMS.sel_crs_gps = 
; main: Selected Course for VLOC
AFMS.sel_crs_vloc = 
; main: V-Flag State (1: declutter
AFMS.v_flag_declutter = 
; main: GPS Selected (0: prompt, 1: auto)
AFMS.gps_selected = 1
; main: Airspace Labels
AFMS.airspace_labels = 
; nav : Mark On Target
AFMS.mark_on_target = 
; nav : RF Procedure Legs
AFMS.rf_procedure_legs = 
; vnav: Vertical Navigation Type (0: VCALC, 1: VNAV)
AFMS.vnav_enabled = 
; vnav: Transition To Approach
AFMS.vnav_trans_to_appr = 
; vnav: VDI Scale (ft)
AFMS.vnav_vdi_scale_factor = 
; vnav: Transition Altitude (180 = FL180)
AFMS.vnav_trans_altitude = 

[GTN_750_2.WINDOW]
; display window if true.
visible = true
; show screen only gauge if true.
nobezel = false
; display type: WINDOW,PANEL2D,PANEL3D,PANELS
frame.type = WINDOW
; display position and dimension (left,top,width,height)
frame.rect = 131,614,594,565
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; enable mouse clickspots if true, disable if false (use SHIFT to override)
usemouse = true
; left mouse button on the screen toggles popup window if true (requires SHIFT+left mouse button).
popleft = false
; right mouse button on the screen toggles popup window if true (requires XP11.1).
popright = true
; VR mode position and dimension (left,top,width,height) (requires XP11.20)
vrmode.rect = 0,790,830,790
; display as popout window if true (requires XP11.1).
undocked = false
; display mouse tooltips if true.
tooltips = false
; freeze display position if true.
locked = false

[GTN_750_2.PANELS]
; display window if true.
visible = false
; show screen only gauge if true.
nobezel = true
; display type: WINDOW,PANEL2D,PANEL3D,PANELS
frame.type = PANELS
; display position and dimension (left,top,width,height)
frame.rect = 0,0,0,0
; screen only border size (pixels).
border.size = 0
; screen only border color (#RGB or #RGBA).
border.rgba = #000000
; enable mouse clickspots if true, disable if false (use SHIFT to override)
usemouse = true
; left mouse button on the screen toggles popup window if true (requires SHIFT+left mouse button).
popleft = false
; right mouse button on the screen toggles popup window if true (requires XP11.1).
popright = true
 

1 minute ago, Looseparts said:

[GTN_750_1.PANELS]
; display position and dimension (left,top,width,height)
frame.rect = 0,0,0,0

It is an empty rectangle. Something went wrong in the ini file and I'd suggest you restore the ini file which comes with the Carenado F33A (I guess there is one included?)

Working now. I put values in the ini ; display position area based on where the 430 is in Planemaker, but that didn't do it. I noticed that in my Just Flight PA-28R - everything worked perfectly. There is no Carenado ini file to edit as far as I could tell, so I copied the RealityXP.GTN.ini from the PA28R folder and pasted it into the Carenado F33A_Bonanza_v1.1 and launched it. 

Partial failure / partial success. Both the panel GTN 750 and the pop out were functional, but very, very dim
(see attached)

so I found the ; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Display = 
; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Buttons = 

settings in the functional ini file brought over from the Piper to the Bonanza and fiddled with the values. 
-100 did the trick !
(see attached)
This is probably not proper, but today I'm very happy. If you or someone shows me the best method, I'll try it, but for now... life is good : -)

Working now. I put values in the ini ; display position area based on where the 430 is in Planemaker, but that didn't do it. I noticed that in my Just Flight PA-28R - everything worked perfectly. There is no Carenado ini file to edit as far as I could tell, so I copied the RealityXP.GTN.ini from the PA28R folder and pasted it into the Carenado F33A_Bonanza_v1.1 and launched it. 

Partial failure / partial success. Both the panel GTN 750 and the pop out were functional, but very, very dim
(see attached)

so I found the ; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Display = 
; integral lighting rheostat index (0 to 3) or percent (-100 to 0)
Rheostat.Buttons = 

settings in the functional ini file brought over from the Piper to the Bonanza and fiddled with the values. 
-100 did the trick !
(see attached)
This is probably not proper, but today I'm very happy. If you or someone shows me the best method, I'll try it, but for now... life is good : -)

Jean Luc. If you want to help me make my plane absolutely complete, I'd like a Garmin a GFC 500 and dual G5s please. Thanks for all you do! This GTN 750 is fantastic!!