I’d say most UI related collection work should be done with array since you don’t want things jumping around in your UI due to Set being unsorted. I don’t know of an article covering the specifics here but @Observable would mean that your UI is stable until the next screen redraw and the Set is accessed again. I would recommend converting to an Array so you have guaranteed stable ordering.

@@DonnyWalsdev Thanks for the response. Obvious from the UI perspective - head slap. Arrays planned for “normal usage” views of item subsets but no fundamental order to the underlying items themselves so I’m starting with a set and a “management/debug” view. Lots to learn. Very different perspective from real time microcontroller systems but I’m enjoying it. I appreciate the info people like yourself, Paul Hudson, Stewart Lynch and others make freely available. They are great learning tools and benefit so many.