Blender Full Screen Window | Toggle Fullscreen in Blender | Blender in Fullscreen mode?
To toggle fullscreen in Blender, you can do one of the following:
Press the F11 key on your keyboard.
Click on the Window menu in the top left corner of the Blender window and select Toggle Fullscreen.
Click on the View menu in the top right corner of the Blender window and select Toggle Fullscreen.
Any of these methods will toggle the Blender window to fullscreen mode. To exit fullscreen mode, simply repeat the same steps or press the Esc key on your keyboard.