Settings holds Buttons' system-wide configuration: the things that apply to the whole install, as opposed to a single position, connection, or route. Most of it is intended for installers and administrators rather than day-to-day operators.
This page is an index. It lists what's under Settings and links to the focused guides that exist so far; the rest are still being written.
General: Buttons General Settings, including the Support section for exporting diagnostic evidence (see Collect support information) and default time zone/clock format.
User Profile: User Management for your own account.