How to turn of #AI in your #GMail account.
GMail -> Settings -> See all settings -> Scroll down to "Smart features" (see image below)
Turn off smart features (it will want to restart, you can do that), then go back there, go into the "Manage workspace smart feature settings" and turn the two options off
If you go back to "See all settings" you will find that a lot of sections are greyed out, because they are turned off.