The addition of this registry key with the specified options seems to be aimed at registering a COM class, potentially for a specific application or component. The use of /hot suggests that the change is intended to take effect immediately, without requiring a system reboot.
If you ever want the Windows 11 style back, just run: reg delete "HKCU\Software\Classes\CLSID\86ca1aa0-34aa-4e8b-a509-50c905bae2a2" /f The addition of this registry key with the
How to fix (example of a valid command to create the key and set default data) : Sets the (Default) value of the registry
A few security vendors have flagged this CLSID in relation to: The addition of this registry key with the
This command adds a registry key that tells Windows how to instantiate a COM class identified by a specific CLSID.
: Sets the (Default) value of the registry key to "null" or empty. Is it safe?