in the drop down menu before your client on the “status” page on your server webadmin.
You can also start it with the client (IIRC) by rightclicking the urbackup icon and choosing what kind of backup you want to run.
I don’t have Windows 11, but have Windows 10.
On the task bar at the bottom is the urbackup icon.
I can right-click on it and select “Add/Remove backup paths”.
There I can change the drive.
If so, there is a dropdown menu where the “client settings” is on your picture, choose the correct client and do the settings on the server webgui instead of changing it on the client.