Hello @thompsontech and welcome to the forum!
What folders? Are you trying to get rid of everything and abandon all your backups, or just get back in?
Probably you haven’t deleted essential config folders, otherwise it wouldn’t be prompting for password.
Downgrading / reverting to a lower version provides info of where the configuration is for your OS type.
Duplicati.Server.exe shows how you can stop Duplicati then start it to disable --webservice-password.
--webservice-password
The password required to access the webserver. This option is saved so you do not need to set it on each run. Setting an empty value disables the password.
Unless you’re using a Windows service, your actual program is Duplicati.GUI.TrayIcon.exe, and its help indicates the option should work there too, even though the manual doesn’t specifically show it as there.