Hi Hubbletoo,
To clarify, starting to safe mode will clear relevant caches and prevents software conflicts so that can ensure your Mac is working as expected and isolate the issue.
Here's how to use safe mode:
Start up your Mac in safe mode
Per this article: Change Mouse & Trackpad preferences for accessibility on Mac
"Ignore built-in trackpad when mouse or wireless trackpad is present
Disable the built-in trackpad on your Mac when you use a mouse or wireless trackpad.
If you use a non-Apple mouse, the driver software that came with your mouse may prevent this option from working as expected. For information, see the documentation for your mouse."
If you're trying to disable the trackpad without having another mouse or trackpad present, try turning on mouse keys along with disabling the trackpad: Control the pointer using Mouse Keys on Mac
Best regards.