Apache don’t use /var/www - Pihole - NextCloudPi

Hey i use the NextCloudPi image and have installed Pihole. Instad of Lighttpd for the Pihole Admin page i want to use Apache. All files for Pihole Admin page are located in /var/www/html. After i have installed Pihole i can connect to Admin page with ***nextcloud.ddns.net/admin with the Lighttpd webserver. But if I stop Lighttpd and start Apache i will be reconnect to the ***nextcloud.ddns.net/login page of my Nextcloud although i typed in …/admin. So ist seems there is anywhere a script or something else.
In my first configuration with the normal installation of Apache und Nextcloud there wasn‘t that problem.

So where can i change that issue?