How to Make a Game Run in Full Screen

Open your Godot project and click on 'Project' in the top menu bar, then select 'Project Settings' from the dropdown menu. Alternatively, you can use the keyboard shortcut Ctrl+S (Windows/Linux) or Cmd+S (Mac). This opens the comprehensive settings panel where you can configure all aspects of your game.

In the Project Settings window, look at the left sidebar where all setting categories are listed. Click on the 'Display' section to expand it, then click on 'Window'. This section contains all window-related settings including resolution, fullscreen mode, and window behavior.

Find the 'Mode' dropdown menu in the Window settings. By default, it's set to 'Windowed' or 'Desktop'. Click the dropdown and select 'Fullscreen' (or 'Exclusive Fullscreen' for better performance). This setting forces the game to take up the entire screen when launched, providing an immersive experience for players.

Scroll down to find the 'Resizable' checkbox and make sure it's enabled (checked). This allows the game window to adapt if the user changes display settings or if the game is windowed. While this doesn't affect fullscreen mode directly, it's good practice for user flexibility.

Press F5 or click the Play button in the top-right corner to run your game. The game should now launch in fullscreen mode automatically. To exit fullscreen during gameplay, you can press Alt+Enter (Windows/Linux) or Cmd+Enter (Mac) as a default Godot shortcut, or implement your own toggle in the game settings.