Change User on Windows Dektop Client

The first time I start Windows Desktop Client I could configure User and Password. Now I want to change the user. I cannot find any Settings neither in the Windows Desktop Client, Registry nor c:\Users\USERNAME\AppData\Local\Nextcloud\nextcloud.cfg.
How can I change the user?
Thanx for help!

You can add the a new account with the new user and delete the old one.

It does not allow to change user, not even reinstalling the client, it only asks for the url and the browser asks for permission to login without asking for user

just make sure that you are not loged in via any browser or anything else. - -then you can setup a new user. Also delete cookies related to the server where you want to connect.

PS: I realy have to say that the support on nextcloud kind of sucks. in addition there webpage in slow as hell. I am not quite impressed I have to say

I´ve got the same problem. I can, indeed setup a new user, but not on the same server. I need to change the user on the same server.
I have reinstalled several times. I have also revoked te pc. Nothing helps.
And i have searched the internet.