Allow a quick way to hide Left/Right version of morph sliders
99% of the time when I'm working with morphs, I only want to use the morphs that affect both Left and Right simultaneously. (For example, "Brow Width", versus "Brow Width L" and "Brow Width R".) Having all those extra sliders around makes it more tedious to scroll through.
I'd like a quick way to toggle showing the L/R versions, maybe a new button down where the "Show Subitems" button currently is.