Roughly Searchable
Highlights items that match the current search in REI
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Roughly Searchable
Requires Roughly Enough Items

Scales items based on current search terms inside any inventory that REI appears in, and can highlight shulker boxes based on contents.
(If you have an ender chest full of shulker boxes, this can help with that.)
ctrl + i to toggle, keybinds and other settings can be found at the bottom of the REI settings.