bottom right icons not working

All those icons in the bottom right of the taskbar do not work, no response despite left clicks on those icons. These include the volume, network, clock and notifications icons. The Action Center cannot be called out as well. However, those hidden icons under the "Up Arrow" work properly.

My desktop is running on Windows 10 Home version 21H2, the latest Windows update was just run yesterday.

The followings have been tried with no improvement:

a) System File Checker - sfc /scannow

b) DISM tool - CheckHealth, ScanHealth & Restorehealth

c) Powershell command

Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

d) Renaming of UsrClass.dat file

e) Restart Windows Explorer

Anything else I can do to solve the problems?