If you have a google account, first go to gemini.google.com/extensions and turn everything off.

Then you need to go to myactivity.google.com/product/gemini and turn off all Gemini activity tracking. You do have to do them in that order to make sure it works.

Honestly, I'm not sure how long this will last, but this should keep Gemini off your projects for a bit.

don't use any of these browsers, they're also chrome

Here are my favorite firefox plugins for security/anti-tracking/anti-ad that I recommend you get