When you ask for help, a mailzy administrator may sign in to your account to see what you see, for up to an hour. They re-enter their own password first, and everything they do during the visit is recorded under their name.
Where you see it
Every visit is listed in Settings, under Support access, with who and when. A support visit never sends you a "new device" sign-in email.
Staff accounts can't be accessed this way. The privacy policy covers what staff can see.