Delete nextcloud client completely windows 10

Expected behaviour:
When uninstalling the windows client, all files and data from nextcloud ist deleted

Actual behaviour:
When uninstalling and installing again, all links set in the app (so all sync parameters) are again there. So nextcloud must store some userdata somewhere.

Question:
How can I completely delete all the data from the windows client?

Most software store user settings in %appdata% and should never be deleted if you uninstall it. This is the expected behaviour. Open this folder and delete the nextcloud folder inside it.