Q:
Filters in PvP
If you only want to play just press “Practice” or “Play” to get in the Queue.
The Filter is for Custom Arenas.
I tried playing unranked, it threw me into two 5v5 matches. Both a group of pugs on my side vs premades. I repeat: Looking for 8v8 not 5v5.
Looking for 8v8 not 5v5.
There is no mode 8v8. You can configure a Custom Arena
https://wiki.guildwars2.com/wiki/Custom_Arena
to be 8v8 but finding such an Arena is very unlikely.