I have reported this a long time ago (in the old forum), but seems no solution until now.
I have three screens and want to run NC on the right screen (FS is in the middle one)
So, I pull the window onto it, scale it, everything ok.
But after I close NC and start it next time it is reset to the main screen with default position and size. So I have to drop it again, and again and again every time.
My temporary solution is to edit the window-state.json (AppData\Roaming\navigraph_charts)
But as all other applications out there could handle my three monitor setup and will keep its position, I wonder what the difficulty is with Navigraph Charts?
So hope you can fix this one day.