Sometimes, a simple reload of the screen can prevent random glitches in the application. ... Allow Roblox to communicate on your computer freely without restrictions by checking the box.

It should fix the issues you are facing with the white screen on Roblox. 2] Turn on Windowed optimization. Open Display settings > Advanced graphics and enable the Windowed optimization.

The mouse cursor can go off screen on Roblox if you have set the monitor scaling above the recommended limit. By default, the limit is set to 100% (depending on the display resolution).