I use VPN 24*7. Earlier I used to be able to hide "VPN active" notification but since I upgraded to Android 12, the option is not there anymore.
What should I do to hide the notification?
The OP seems to ask about VPN-app's own custom-notification,
I mean, because newer Android versions no longer show such notification.
You can only get rid of said custom-notification,
by removing notification permission of said app.
Another option would be asking their developers (or customer support) for such feature.
It's little hard, but said developers can remove notification,
by starting their
VpnService in a separate process, like: