I also have this problem with all Graviteam games, because I have a Ultra-Wide screen, and using standard settings there is always some button or part of the screen I cannot see well, except in game which is fine. Seems to me that the loading screens, menus have different resolutions.
First remedy is to use Compatibility setting of the game shortcut and click on Disable Scale adjustment for high PPP screens.
If this does not fix it, as is my case, I use Nvidia control panel. There are special settings for Size and Position, go to second tab (Size) and adjust screen to a lower size than usual, so that everything fits.
A bit buggy, but is is still the best tank game ever!