Handling of hide vs. shy should be improved

Not clear that hiding objects more than convenient action when building the UI (shy is for that).

From the manual: Note that unlike the “shy” and “lock” columns, the presence or absence of the eyeball changes the runtime behavior of your presentation. You may wish to use the eyeball to temporarily hide an element during editing, but be sure to re-enable the element if it is supposed to be present on this slide.

Needs UX study and a new UI design that fixes this.