How can I Disable Tray Context Menu?
Disable Tray Context Menu
Removes context menu from Task Bar and System Tray Bar. While this restriction is turned on, a user can not open Task Bar and System Tray Bar context menu using right mouse button or any other way.
Option affects selected user, see the status bar. Reboot your PC to activate or deactivate this option.
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Limit access to key features of Windows PC ...