Some comments on the filter / options drop down:

- There seems to be a lot of “whitespace” in the top half.
I would try something like squishing all the first four options together and removing the Search header, for example:
[ ] Sync Selection
[ ] Sort Alphabetically
[ ] Case Sensitive Search
[ ] Exact Match
That ordering and the addition of the word “search” seems sufficiently descriptive and highlights Sync Selection as the most major mode setting.
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What happens when “Sort Alphabetically” is off? Is it creation order, or what? There should be a tooltip that explains this (currently there’s no tooltip for this option).
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The currently un-checked options in this panel are too dark. They actually appear disabled and it looks like you should not be allowed to select those search options for example. I was actually surprised to discover that across Blender selected checkbox text does actually get slightly brighter but it’s a very subtle effect that should be used here as well.
When [ ] Objects is deselected it makes sense to show the sub-options below it as “disabled” but the drastic dimming should only be used to indicate something is actually disabled and currently not applicable and potentially not enableable.
- With “Sync Selection” as well as the search options, the “filter” icon feels less and less appropriate and maybe it should really be changed to a settings “gear” icon. Having filter options in settings feels more right than putting non-filter options under “filter”.