Are you using Ublock Origin ? Add "google.com##.hdzaWe" without quotes to your Ublock Origin My Filters to block the google AI overview and apply changes.
@nixCraft
For everyone interested in blocking more AI slop to avoid loosing brain time to filter garbage, there's this (still regularly maintained) uBlock Origin block list :
https://github.com/laylavish/uBlockOrigin-HUGE-AI-Blocklist
GitHub - laylavish/uBlockOrigin-HUGE-AI-Blocklist: A huge blocklist of manually curated sites that contain AI generated imagery for uBlock Origin & uBlacklist.

A huge blocklist of manually curated sites that contain AI generated imagery for uBlock Origin & uBlacklist. - laylavish/uBlockOrigin-HUGE-AI-Blocklist

GitHub