Setting up Multi app kiosk, not able to find the "AssignedAccess" under "Runtime settings"

Question

I am trying to setting up the multi app kiosk mode using the documentation provided by Microsoft:

"https://learn.microsoft.com/en-us/windows/configuration/lock-down-windows-10-to-specific-apps"

I am able to follow the most of the steps.

but I got blocked as I am not able to find the particular option in the "Windows Configuration Designer"

i.e. "AssignedAccess" under "Runtime settings".

I have installed the "Windows Configuration Designer" from the Microsoft Store and followed the steps.

But "AssignedAccess" option is not visible and I am kind of blocked and not able to proceed.

Please do help, so that I can further.

My windows details are:

Edition: Windows 10 pro

Version: 1903

OS build: 18362.418