Go to the Point of Sale application,
Enable the option Restaurant: activate table management and click on Apply.
Then go back to the Dashboard, on the point of sale you want to use in restaurant mode, click on.
Under the Restaurant Floors section, click on add an item to insert a floor and to set your PoS in restaurant mode.
Insert a floor name and assign the floor to your point of sale.
Click on Save & Close and then on Save. Congratulations, your point of sale is now in Restaurant mode. The first time you start a session, you will arrive on an empty map.