Two buttons on the Genius POS both say logout and they do very different things. Confusing them is the most common way a site ends up locked out at open.

Logout, the one staff should use

The Logout button sits in the lower right corner of the Room screen. It signs out the current staff member and returns to the PIN screen so the next person can sign in. The device stays signed in to the account.

System Logout, the one that needs a manager

To reach it, tap Options on the Room screen, then Settings. System Logout is the last item in the Manager Settings menu.

System Logout signs the device out of the account and returns it to the Account Login screen. To get back in, someone needs a valid Device Login Code for that account from the Admin Console.

The practical rule

Staff use Logout. Only use System Logout when you are deliberately moving a device to another account or handing hardware back, and only when you already have a device login code in hand.

Source: Global Payments Genius POS User Guide and Genius POS Setup Guide. Newly built article, pending review.