I have an issue that my mouse pointer turns into a black square box, like a ■ . Why?
How to Fix the Issue
The solution is: just change your mouse pointer size, and then back to the original size. However, it's only a temporary measure. It does not remove the root cause. I show step by step guide below.
Step1: Open Settings on windows 10.
Step2: Click on Devices
Step3: Click on Mouse. Then, click on Adjust mouse & cursor size.
Step4: Change your mouse pointer size, and then back to the original size
I don’t know why this issue happen, but in my case, the black square usually appears in the evening. I hope this bug will be fixed soon!