In your Basic Info, you can toggle on Kiosk Mode and set a password (this is necessary).
On the secondary device you want to use as your kiosk, click on Continue as Barista.
On the next screen, instead of signing in with Apple, click “Enter Kiosk Mode”.
From there, you will see a list of nearby coffee shops (presumably just yours will be nearby).
Click on your shop and enter the kiosk password you created for your shop. This will enter the device into kiosk mode and allow customers to place orders.
Below is the default page for creating orders. Customers can follow along and easily place their order.
On the final page, the customer is given the option to tip with an emoji!. If they click submit, or after 1 minute, the device will go back to the main screen for the next customer.