absolutely something that would be handy as some items are hard to guess what crafting category they are under.

ive found https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=911399676 to be pretty darn useful for nearly all my 'on-the-fly' recipe search needs. don't let the 'for PZ 36.4' fool you though, it was updated just recently.

https://theindiestone.com/forums/index.php?/topic/25180-crafting-ui-lacks-global-recipe-search/ has some "patch" files (text files showing differences in a file) that you must manually edit the files of but it's only 4 lines to add to \media\lua\client\ISUI\ISCraftingUI.lua to get an "All" tab in the craft window which will show ALL recipes (but is slow-loading and scrolling) with a filter option. Better than nothing anyway! There's another patch to add a focus filter keyboard shortcut but I didn't bother with it.