Shift mode in Roblox is a handy little feature that lets players enjoy the game from a third-person camera viewpoint when the shift key is pressed.

Step 1- Press and hold the "Shift" key on your keyboard while playing a Roblox game. This will enable the shift lock and the camera will lock in place.

If you are in either situation, you can follow this tutorial to turn on or off Shift Lock for Touch keyboard. For your information, you can enable Shift Lock by clicking on the Shift key twice.