Press F11 on Windows or Linux
Press Fn + F11 if your keyboard requires the Fn key
On Mac, press Control + Command + F
Open Minecraft
Go to Options
Go to Video Settings
Set Fullscreen to On
Restart Minecraft if fullscreen does not apply immediately
Press F11 on Windows or Linux
Press Fn + F11 if your keyboard requires the Fn key
On Mac, press Control + Command + F
Open Minecraft
Go to Options
Go to Video Settings
Set Fullscreen to On
Restart Minecraft if fullscreen does not apply immediately