The Zoom Panel needs to have the same functionality as the zoom popup, since many people have the panel shown all the time and don’t use the popup at all.
I use the popup in preference to the Zoom panel as it takes no extra space.
I don’t see any difference between them. Both only show the large glyph and the code point. All three are enabled in options, so maybe there’s a bug here, or I forgot what they are supposed to do.
We’ll fix this with the next upcoming release.