Hello,
is a possible change default name in web pages :
Maybe it's stupid, but I'm asking.
I'm not sure how this would hold through an update, but try editing line 226 in the file
admin/scripts/pi-hole/php/header.php
It's not possible without manually editing a few files, and it's not a planned feature.
You must be root to save.
Run this
sudo nano +226 /var/www/html/admin/scripts/pi-hole/php/header.php
and this https://snag.gy/Btc3sm.jpg ?
can not find in /var/www/html/admin/scripts/pi-hole/php/header.php
sudo nano +240,53 /var/www/html/admin/scripts/pi-hole/php/header.php