not to put too fine a point on it, but this info is covered by the user manual, as bad as it is, and not too shabbily. The UI Dots (and the other dots there in the drop down for it) are a sort of "clipboard" for your user interface. I have several fairly standard layouts for doing different types of images (I have one for a 4 by 6 image and one for video, for example). They let you change your interface in a single click. The one you might find really useful down the road is the Pose button set. That let's you save a pose. Pretty handy...

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)