Tremolo notes don't appear when "tremolo" is entered in filter field
If you type "tremolo" in the search filter field, you see various tremolo-related items, but none of the tremolo notes. This leads to the strong impression that the tremolo notes (i.e. notes with slashes through the stems) are not present in MuseScore, when of course they are.
I'd suggest adding "tremolo" to the filter-trigger tags of the tremolo notes (if such an infrastructure exists).
I'd also suggest that if a category of items (e.g. "Tremolo") matches the filter, that all those items be shown.
(E.g. if you enter "articulation", none of the articulations show up, despite there being a whole submenu of articulations.)