Ultra-HD display (e.g. 4K) reportedly starts with the screen only partly visible. Somebody reported setting text scaling back to 100% solved that problem but text, especially in dialogs, seems to be cut-off at times (probably text is displayed too large). Possibly playing with "Change high DPI settings" (right-click taxinaut.exe -> Properties -> Compatibility tab) might provide a work around. Try letting taxinaut manage the scaling. If you have an ultra-hd display and are willing to assist me to fix this let me know. I'll give you a free key for the game.
2020/03/06 update: Somebody mentioned not just setting the text-scaling back to 100% but also 'other' scaling? I don't know what/where that is in Windows but it might help you. Another thing you can try is in config.txt (in install directory where taxinaut.exe) is change 'uiscale=auto' to:
uiscale=no
I'm working on a way to detect the 150% scaling and do something automatically but this might take a while because as I said before I don't have a 4K monitor so I'm dependent on somebody with a 4K and patience to assist me with this.
2020/03/12 update: This should be fixed as of V0.7.3.