Yes, you’re correct. If you want to be hidden you need to only log into accounts that you’ve only accessed through TOR. IIRC, TOR actually tells you this when you open it for the first time, or at least it used to. It also tells you things like to not resize the window, because window size is a fingerprint that can be used to identify you. You shouldn’t full-screen or resize it. There’s a lot of ways to identify people that they don’t even think about.