Room tick for a person (old, not shown)
What it is
A tick box for one person and one room in an old Rooms & who may use them table. In this configurator version the code that draws it is never called, so it does not appear on any screen.
What to enter
Nothing. It is not shown.
What it changes
Nothing, because it is not shown. (It would decide whether that person's app shows the room after the next deploy. Admins always have every room.)
If it goes wrong
Room access is set elsewhere; see the help for the Users and Rooms steps.