How can I delete my Gmail account on my mobile phone from my friend?

I registered my Google account with my friend on his mobile a few weeks ago because we wanted to see something.

But since then we can't delete my account from his mobile phone anymore.

Is a bit uncomfortable because it allows me to read all my e-mails and also can write oneself.

He has a Huawei P20 lite

I would be very happy to receive answers

Android (Developed by Google) probably wants to have some Google Account. That's why he should create one and sign up with it. Then it should not be a problem to log out of yours.

He also gets the e-mails only through the Gmail app or any other e-mail app. It can't be that difficult to log out.

Go to "Accounts" on Google Accounts, go to your account, and click "More" and then "Remove Account" below. ♂️

But only works if at least a second account is stored on the smartphone.

Because ONE account needs Android.

Change your password, then nobody sees anything anymore

Thanks, it worked