You find normally the apache2-servername in the virtual hosts configurations.
/etc/apache2/sites-available/
/etc/apache2/sites-enabled (links to other dir)
Sorry. I do not use Snap and do not like it.
I thought Mint does not use it anymore.
Sorry german: https://www.heise.de/news/Linux-Mint-20-Desktop-ohne-Snap-Pakete-4797111.html
Please read for further help: