How to remove old ADMX settings from a GPO

When encountering below text in a GPO and you do not have or want to return to the older ADMX files.

Display names for some settings cannot be found. You might able te resolve this issue by updating the .ADM files used by Group Policy Management.

Then this can be simply resolved with below PowerShell command:

Remove-GPRegistryValue -Name "Name-of-GPO-involved" -key "HKLM\Software\Policies\Citrix\UserProfileManager" -ValueName DeleteRedirectedFolders