On the admin dashboard settings page, the limited access password provides a way to give access to some of the administrative tools without giving access to any system or website settings, or editable fields.
If you log into the Team/Admin Dashboard and you are not finding important pages, or the settings page, or you are not finding the ability to edit the settings you want, you very likely have logged into the admin dashboard with the limited password.
Of course, it's imperative that the limited password is different than your normal password.
You login with the same email address as your normal login, the password determines what you get access to.
You can set the limited password at any time, by going to setting #33 on the admin dashboard: