Where you find this is:
1. Go to your Google Account (e.g. www.google.com, click on your avatar, then on Manage Google Account in the popup that appears.)
2. Click on Security in the left navigation pane.
3. Scroll down, and find a box "Your connections to third-party apps & services".
That reminds me, I did a "continue with Google" on the Scribd website the other day, only to be told I had to also give them a credit card so they would let me start the free trial to view someone else's copyrighted PDF that they have no right to sell, and that I can find somewhere else. I have to revoke the association to these scumbags.