Welcome, and glad the font-size changing wasn't too hard to find! Sorry about the video though. The one that you mention was put into the system in a fashion different from the subsequent ones—we should probably update it.
We're working on an updated mobile client now which we think will be a pretty big improvement. Since we're such a small shop, we probably won't get a chance to update the existing Android client until then.
There's no web page for it, but I can delete your account if you like.