Rename "Filter by Guild" to "Filter by Game" and move it up top where prospective members can see it.
For multi-game guilds, prospective members have been looking at the default character roster to find an officer name in game to contact and/or get a general idea of how many are playing. They are not seeing the sort tucked away at the bottom right. Would be very helpful to make this sort feature more prominent.
We may revisit this in a future release, but it is not currently planned functionality.