Go to the Point of Sale application,
Edit and Enable the option Is a bar/Restaurant and click on Save.
Then go back to the Dashboard, on the point of sale you want to use in restaurant mode, click on.
Under the Order Interface --> Table Management section, click on Floors 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.