The Administration menu appears for accounts with the admin role and holds
everything that configures the board through its interface. An account becomes
an administrator by having its address listed under PromoteAdmin in the
board's configuration file at the time it signs up, which is the one part of all
this that happens outside the interface and that is covered in the repository
rather than here.

Everything on these pages is stored in the database rather than in the configuration file. It takes effect immediately and survives a restart. The configuration file instead holds what the board needs before it can read a database at all, meaning the database itself, the cache, the storage providers and the delivery targets, and the admin pages then point at those by name.
The page itself: Administration