if you don't use the app but the good old web browser on a PC/Mac:
- Click on the cog to get to the Settings.
- Click See all Settings.
- Click the General tab.
- Ctrl/Cmd-F to find the 'Smart features' and uncheck it. You may want to check in "Manage Google Workspace smart features" if everything is turned off.

Sorry if my aversion to advertising comes off as smarmy, im tired of seeing companies go from focusing on providing one good service like email and trying to become the next one corp fits all replacement for google. Instead of doing one thing extremely well it becomes a race to do as many things as they can and get people to replace one monolith with another. 
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