Where is advanced in settings

Watch this GIF below for Advance options in Mail and Safari

I'm not sure if this is what you are referring to but if you use an internet browser on a computer and log into iCloud.com and then click Account Settings, there is an Advanced section on that page. It has sections for restoring data, for signing out of all browsers and for managing apps that can look you up.

It could be in Passwords and Accounts > Accounts.

You don’t have Settings > Passwords and Accounts? If you explain what you are trying to achieve someone might be able to help.