Retail devices are shared, so the login model is built around fast user switching rather than one long session.
The app can be configured to lock and then unlock with a PIN, so the till is never left open between customers. Turn this on for any device on an open sales floor.
When PIN and lock screen are enabled, staff switch by entering a 4 to 6 digit PIN. This is the fast path between cashiers on one terminal.
On the app Home screen, tap Log Out in the top right corner.
Use the reset password flow from the login screen. To change a password from the back office, select Staff in the Merchant Portal navigation menu on the left.
Profile information can be changed from inside the POS application as well as from the portal.
Source: Global Payments Genius Help Center for Genius for Retail. Confirm menu paths against your own portal, as some options vary by package and region.