In at least 25% of the random groups I join, there is some person who is AFK and doesn't move for 10+ minutes (ie, the entire floor clear). Why can't these players be removed? It ruins the entire game experience.
Right now I spent energy to join a group, killed literally nothing at all and am stuck at a gate because a full party button cannot be activated with an AFK player.
Click the cog button on the top left of the screen, and pick the option labeled "Party."
See who the Party Leader is. That's the person who can kick.
If the AFK person IS the Party Leader, instead click the Party Options button and pick Go Solo. You'll be put into an exact copy of the dungeon you're in, with the same health/items you're holding onto at the time, but there's a technicality where all the heat you earned in that stage so far will vanish. (But since you haven't killed anything, that's probably zero heat lost anyway.) With luck, more party members can join you.