For the longest time I could not figure out why the Map view would not show any messages.

I was stunned when I discovered that the tiny square next to the group name in the "Groups" is actually a checkbox, and that I'm supposed to click it. It looks like a list bullet.

Can you make the UI for this more discoverable (when Groups is collapsed it's impossible to tell what I need to do) and obvious (bigger, more clickable checkbox)? Perhaps instructions in the empty chat area when no groups are selected?