Did they remove this? How do I navigate to it now?

I'm a student who primarily uses my parents' Amazon Prime account, but my partner gave me access to his account via the "switch accounts" option. As soon as I logged in to his account, the home page was recommending me things that I had looked up/ordered from my parents' account. I switched back to my parents' to see if it went both ways, and it does. I can't find anything anywhere about whether or not it's just because of the cookies stored on my devices or if my parents will also have items recommended to them that are looked up from my partner's account somehow. Is there anybody that has an answer to this?

Pretty much what the title says, my parents have prime and I don’t so I have their account on my phone. We are not in the same household, completely separate emails and such. They do not have access to my account.

When I search something or view something on my account, I notice it shows up on their account as well, and vice versa. I’m a 27 year old woman so I’d rather not have my parents see everything I look at or search (I might have searched up vibrators and damn near had a heart attack when I went to my parents account and first thing that popped up was a huge ribbed dildo saying “view again”, lol…). Anyway to stop this? And yes I have deleted the search history but I’d like to not have to do this everytime. Thanks in advance :)