In order to change the shift, you must go to: POS F&B and Retail (Food & Beverages) → Point of Sale → Change of Shift
The Change of Shift section will appear on the screen.
You must select the Point of Sale that is making the change with the Pencil icon. A Change of Shift section will appear with the selected Point of Sale, the name of the shift that is open and a drop-down field will appear to select the new shift, click on the Change Open Shift button and the new shift will be ready to operate in P.O.S.