>> It would be nice to have an "All Styles" choice at the bottom of the Styles list, as well as an "All Objects" at the bottom of the Objects list.

After some further thought, I realize that this doesn't make sense.

Instead, it would be good if you could right click on one of the Styles and select an option that might say something like "Display Only This Style". This would then hide all other Styles, except the one Style that you are choosing. You could then do the same thing with Objects and Types.

And instead of right-clicking on the Style and choosing from an option menu, you could use a different key combination, such as Alt-Click to hide everything, but the one that you are right-clicking on.