Unless you're networking via wifi to other devices, just remove it totally with: "sudo apt-get remove avahi-daemon" - you'll be glad you did, for it can occasionally be a glitchy piece of work...
I've had problems with Avahi since Ubuntu 17.10 just trashing my wifi and disabling it requiring a reboot to get wifi back online. Just installed Lubuntu 18.04.5LTS on another laptop, and it began messing with my wifi on that computer too...
I also believe it can be a security risk allowing unauthorized computers to mess with my wifi. Occasionally I'd have two (2) sets of wifi bars in the panel - weird! Other times it would drop wifi, reload, drop again and not be able to reload without rebooting. I have no use for it at all...
I'm sure it can be valuable to some, but to novice users it can become an ongoing nightmare!!!