As discussed in Bug 29222, jQueryUI autocomplete should be replaced. The last time I checked it was used in these places: - Checkout and patron header searches - Article request patron search - Course reserve instructor search - Holds patron search - UNIMARC 210c plugin - UNIMARC 225a plugin Possible replacement candidate: https://tarekraafat.github.io/autoComplete.js/.
Linking to bug 29222 comment 3 and bug 29222 comment 4, and https://gitlab.com/joubu/Koha/-/commits/bootstrap-autocomplete
There is also https://iqbalfn.github.io/bootstrap-autocomplete/