Without a doubt, Apple has consistently improved the Shortcuts app. But with iOS 14, they took a huge step backwards with the Choose from List action especially obvious when the list is long.
The Search field (a.k.a., filter) at the top was removed.
Scrolling up and down a rendered list is very slow and inconsistent.
For long lists I employed a work-around that I discussed in reddit and shared on RoutineHub, but I’m curious if any of you have developed something better.
Dont know of one offhand, but you could try looking through something like code pen for posted js/css. Cant remember if thats where I originally found the js/css but its usually a good place to find things like that.