Multi-app kiosk mode is a lockdown feature for Windows 11 that allows an IT administrator to select a set of allowable apps to run on the Windows 11 device, while all other functionalities are blocked. It is an ideal scenario in which multiple people need to use the same device.
With the Windows 11 Build 25169, released to Windows Insiders in the Dev Channel, Microsoft introduced this feature for the IT administrators to test before it rolls out to a global set of Windows 11 users.