I actually like the default map planner but there is one thing about it I wish they would change. When you pick an arrival or destination-why does the huge white box come up that covers all the map detail of that area? Why not just a colored small icon that's not so LARGE? I think this part must have been designed by whoever designed the huge taxi ribbon that makes the sim look like a cartoon.

Use Simbrief

 

I can, but I want also to use also the default flight planner and so, have the same complaint as WMAC314. Asobo should have to fix the issue, which is very annoying.

I would highly recommend LittleNavMap.  It produces flight plans that can be directly imported into MSFS.

I use it all of the time and is very simple to use and has many features.