When customers are using the Clover Mini as customer-facing device, the Clover Mini is placed into customer mode.
Ensure that a PIN is required when leaving customer mode by verifying that REQUIRE PIN ON EXIT is turned ON in the bottom bar. This will require an employee PIN to return the Clover Mini device to merchant-facing mode.
Reference Site: https://help.clover.com/faq/how-can-i-be-sure-that-customers-can-not-access-other-apps-on-clover-mini-when-its-used-as-a-customer-facing-device/