[Rey Realms]
We've tried multiple methods to fullscreen the game.
• Clicking [Fullscreen] from inside the display settings in the game.
• Super\Windows\Command key+M key
• Super\Windows\Command key+Up arrow key
• Super\Windows\Command key+Left arrow key
• Super\Windows\Command key+Right arrow key
• Alt key+Control key+Up arrow key
• Alt key+Control key+Left arrow key
• Alt key+Control key+Right arrow key
• F11 key
• Alt key+F11 key
None of these actually work, though.
If it helps, we are running the game through Steam (as a non-Steam game) on Linux.