I have two very important suggestions:
It is vital that employees cannot modify the prices on the menu, even if they have access to the menu, as they need to update stock availability in some cases.
It would be great to have a virtual kiosk system so that customers can place orders on screens, and the orders are sent directly to the system.
Please contact support. There are user permissions to prevent price changes on menu.
There is a way to use line a kiosk. Support can provide examples