If you enable this setting users will not be allowed to switch between recent apps. The App Switching option in the PC settings app will be disabled as well.If you disable or do not configure this policy setting users will be allowed to switch between recent apps.
Policy path:
Windows Components\Edge UI
Scope:
User
Supported on:
At least Windows Server 2012 Windows 8 or Windows RT
Registry settings:
HKCU\Software\Policies\Microsoft\Windows\EdgeUI!TurnOffBackstack
Filename:
EdgeUI.admx