Cant disconnect folder sync connection


by accident I created a folder sync connection with my client on my pc to the userfolder of my system. Right after my system startet to have problems. I quickly deinstalled nextcloud client.
After reinstalling the client the folder sync connection still seems to be linked on my userfolder cause I see a little icon on the username and in the properties the shown size is way too big for my internal ssd.
Unfortunatelly I don’t see any running connection in my nextcloud client, so I can’T get rid of this ghost connection.
Is there another way to get rid of this connection by deleting some strange setting files somewhere nested in a hidden folder on my system?

Thx, Marco

client settings are stored in %appdata%\Nextcloud\nextcloud.cfg

I deleted the file but the folder still seems to be connected.