Pressing F3 ( Fn + F3 on Mac and some laptops) brings up the debug screen, but without the graphs. The graph appears upon pressing ⇧ Shift + F3 ( Fn + ⇧ Shift + F3 on Mac and some laptops). Information about the player’s speed and whether the player is touching the ground have added to the debug screen.
Read moreWhat does the debug screen do?
The debug screen is a feature which allows a player to view elements of the game, such as the coordinates and the biome you’re in . It’s accessed by pressing the F3 key, which can also be used to do certain actions, like reloading chunks or cycling Creative and Spectator modes.
Read moreWhat does F3 and T do in Minecraft?
F3 + T – Reloads all textures, sounds and web-loaded client resources . This is useful for texture pack creators.
Read more