When accessing File Explorer.exe within an app or accessing it as a published app it does not refresh properly when you create a new folder, rename, delete etc.

You have to manually refresh for it to update

Caution! Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system. Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk. Be sure to back up the registry before you edit it.

This issue is addressed by the new Shellbridge feature. To enable Shellbridge:

1. Install Citrix VDA version 2206*.
2. Add the following registry details:

HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Citrix Virtual Desktop Agent
Name: Shellbridge
Type: REG_DWORD
Value: 1

3. Install the required updates for Microsoft Shellbridge feature as follows:

OS	Bug	Release	Release Date	KB
Windows 11	38650176	5c.22	05/24/2022	KB5014019
Server 2022	38134685	5c.22	05/24/2022	KB5014021
Windows 10	38134680	5c.22	05/24/2022	KB5014023
Server 2019	38134670	5c.22	05/24/2022	KB5014022

Note:  Does not apply to Windows Server 2016. 

* You can check if LCM-7673 is listed in "Fixed Issues" when version 2203 CU1 is released.  This version is planned to contain the Shellbridge feature.

Workarounds if you are unable to upgrade to a release of VDA that supports Shellbridge: 

Create this Registry Key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\EXPLORER.EXE
DWORD:  DontUseDesktopChangeRouter
Value:  1

If the above registry key does not help, here is a different registry setting that may help: 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI
DWORD   SeamlessFlags
Value    2000 (Hexadecimal)

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Problem Cause

Issue is related to Server 2019 OS limitation. 
Citrix has identified the compatibility issue with customshellhost. A change in Windows 2019 internal implementation does not have the same shell APIs that are in previous versions of Windows Server.

Previously fixed for Server 2016:
https://support.microsoft.com/en-us/help/4025334/windows-10-update-kb4025334

“Addressed issue where File Explorer does not refresh changes automatically when using RemoteApps on Windows Server 2016.”

https://docs.microsoft.com/en-us/windows/win32/shell/app-registration