Your floor
Tables is your floor plan. An order is attached to a table, and the table shows as occupied until the bill is settled.
That is what tells a host where to seat people without walking the room — which is the entire point of maintaining it.
Setting it up
Add your tables before your first service. Name them the way your staff already refer to them, not the way a floor plan drawing does. If the team says "the one by the window", a table called T14 slows everyone down.
Clear tables as guests leave
Settle the bill and clear the table. A table left open ties up a seat that is actually free, and on a busy night that is turnover you do not get back.
"A table shows occupied but nobody is sitting there"
The bill was never settled and the table never cleared. Settle it and the table frees.
Reservations
Reservations holds bookings — who, when, how many, and which table. A reservation that is not recorded is a table you will sell twice, and one of those two guests will be standing in your doorway.
Branches
If you run more than one outlet, Branches keeps them apart — each with its own floor, menu pricing, stock and takings, with reporting across all of them when you want the group picture.
The service chapter of the RestaurantOS manual covers the floor, the kitchen and the till together.