That does sound frustrating. It seems like the program might be getting stuck in windowed or borderless mode instead of entering proper fullscreen. You could try toggling fullscreen with Alt + Enter, or go into the graphics settings and switch between fullscreen, windowed, and borderless modes to test which works correctly. It’s also worth checking that your monitor resolution and Windows scaling settings are set properly. In some cases, applying the changes and restarting the game/app can solve it too.