Cursor disappears

Hello Sorry for my bad English. I have the problem that with an externally connected mouse the mouse pointer disappears at some point. However, the function remains. If I use the trackpad on the laptop, the cursor immediately reappears and works normally. I have already tested three different mice. Two wireless mice and one cable mouse. I also completely reinstalled Zorin OS. Do you have another idea?
Sorry again for the bad English.

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Have you installed Zorin 15 Core or Lite? Or Zorin OS 16 Core?