ATOM has two Settings.
ATOM SETTINGS (the gear at the top) are yours and stay the same when you switch tours: theme, text size, language, time format, what you see first, YO ATOM and its voice, alerts, sign-in and your account. Agencies, managers and assistants and Brand & Logos live here too, as lists that show every tour you have, each one named.
TOUR SETTINGS belong to one tour, and the title names it: runs and dates, tour home base, people and access, holds, agency and calendar feeds, crew rules, money for this tour and the weekly email. Switch tours and you see that tour's settings. Only tour managers and admins can open them.
Each page has a line near the top that says which one you are in and links to the other.