You can use the parameter dials to fit, though you'll end up having to move the cameras a bit to view as you do it. The last object stays highlighted until you pick something else which in turn highlights. You can simply move your mouse somewhere else off of the prop/hair onto one of the non preview area of the screen if it drives you bonkers.

The dust settled, thinking "what a fine home, at least for now" not realizing that doom would soon be coming in the form of a vacuum cleaner.