To get rid of the blue box on Roblox, press the backslash key (“). This blue box appears when you accidentally hit the UI navigation key. Pressing the backslash key again will turn off this feature and remove the blue box, letting you continue your game without distractions.
If the backslash key doesn’t work, try pressing the hash/tilde key (`#/~`). This key might be the UI navigation key on some non-US keyboard layouts. Give it a try, and the blue box should disappear.
Another solution is to navigate through the in-game menu. Go to the menu, select a few options, and then exit the menu. This simple action can sometimes resolve the issue and remove the blue box.
Following these steps should help you get rid of the blue box on Roblox. Now you can enjoy your game without any interruptions.