Charles, I think the OP is asking if the gallery has an accordion (or flyout) type view where you firstly click on a category to see its contents. This can be useful because the preview of entries means each one takes up a lot of space and there is a lot of scrolling when you have 20+ entries.

I don't believe this is possible with a single building block gallery.

It is possible to build your own custom ribbon with dynamic ribbon menus & submenus but it is complicated and not something you might easily find online for free.

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Andrew Lockton
Chrysalis Design, Melbourne Australia