Web server config cannot be deselected as client
As a client, if you have activated a Web server config (Apache) for a website, the directive snippet cannot be deselected. The change to "-" is not saved. As Admin however it is possible to deselect the directive snippet at Sites => Websites.
Web server config should be deselected and entry in apache2.conf should be removed.
Server OS: Debian
Server OS version: Stretch ISPConfig version: 3.1.13p1