Solutions
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D-Micha's post in Proline PreSet was marked as the answerYes ist possible to Change the preset.
1. click on PRESET to make the VOR2 active in the display
2. on the Panel between the PFD and the MFD click on NAV
3. on the same Panel turn the upper rotary knob (the blue one) to select the VOR1 on the PFD near the PRESET button
4. last click on NAV again and you are done