Hi! I'm on a Windows 11 on an Acer Nitro 5 

Just tested it out again and found out this goes for both Steam and Non-steam versions and that the difference in which windows (Create and/or Menu bar) disappear is whether you minimize it on the Masterplan 'Welcome screen' (pls see link)

https://imgur.com/a/ZAQQLPz

The first gif is when you minimize it after closing the 'Welcome screen'

Second gif is when you minimize it on the 'Welcome screen'

In both cases Masterplan closes/crashes when you try to resize the window after minimizing it.

I hope this clears it up. Please let me know if you can't see the gif (not sure I remember how imgur works).

PS Sorry I made a mistake on the first post it said 'Edit > Create' instead of 'View > Create'