In the taskbar of your Windows operating system, you can usually activate and deactivate the Wireguard client for VPN connections. However, the client does not seem to be listed anymore, although Wireguard is definitely still installed and repairing or changing it via the Control Panel did not help either?
Unfortunately this is a common Windows problem that causes system icons to disappear from the taskbar.
To solve this problem, close Wireguard.exe in the task manager and restart the computer.