The cursor disappears after you upgrade a Big Sur

Bourrasque wrote:

The cursor disappears after updating Big Sur. I'm watching a video on You Tube on a Macbook Pro 2017, after a few minutes the cursor disappears, I use three fingers to switch to the desktop and the cursor disappears, how can I solve this problem?

Reboot and try again...

Uninstall all third party apps that are Cleaners/Optimizers/Anti-Virus

To trouble shoot further you can:

—Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login and test. Reboot as normal and test as caches get rebuilt.

In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.

This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.

—Test issue in another user (or guest user) account  https://support.apple.com/en-us/HT204443

This will tell you if it a universal issue or isolated to your user/admin account.