On Windows 10, playing game through Steam for PC, when I change the graphics setting to fullscreen it stays that way only for the tab you are on. For example, on the main game bar at the top you select the "Packs" tab and enable full screen it will remain that way while on that tab. The moment you switch to another tab such as "Home" or "Store" it will revert to a windowed version of the game when it gathers data from the server. This issue remains persistent for all tabs and when checking the setting it will show it is enabled for fullscreen even though it had already reverted to windowed mode. This wasn't an issue last I played this game.