This bug was partially fixed last week but there are 2 parts to this bug. You fixed the issue where, when the game is started in window mode and switched to fullscreen and back to windowed the maximize button was disabled. -- Thanks for fixing that.
When the game is started in fullscreen mode and you turn off fullscreen the maximize button is still disabled.
Thanks.
[0.12.7] [kovarex] Maximize button disabled when switching from Fullscreen to Windowed
Re: [0.12.7] [kovarex] Maximize button disabled when switching from Fullscreen to Windowed
Thx, it is fixed for 0.12.8