So far the Asset Browser just showed the same popups and settings as the File Browser. Not all of them made sense for the Asset Browser though. * Don't show inapplicable recursion toggle. * Don't show sorting options, which don't work with assets anyway. * Don't show the Filter popover, there are currently no applicable items in there. Just like in D12057, I decided to add separate classes for the Asset Browser case. Differential Revision: https://developer.blender.org/D12059