Most laptops have a touchpad toggle key. The cursor often reappears immediately. A simple restart can fix many problems.

I kept losing my cursor on a big monitor. PowerToys Mouse Utilities fixes that with Find my mouse, Mouse Jump, and Crosshairs ...

If your mouse cursor turns white or disappears in text fields in Chrome or Edge, use the following solutions to fix this problem. You should also clear the cache and cookies of Chrome and Edge.