At the top left of the kitchen screen is an indicator to show if the kitchen is currently open or closed. When the kitchen is open, there will be a close kitchen button further down the screen.
Pressing this will set the kitchen to closed and prevent any orders being placed by customers using TableTab or MemberTab.
Note, orders will still be able to be placed by staff on BarTab so it is important to make sure staff know that the kitchen is closed as well.
To open the kitchen again, press 'Open Kitchen' which will have replaced the 'Close kitchen' button.