With the latest assistant update, the ability to "star" threads when in 24-hr mode was removed. This was a simple way to save an assistant thread via both mobile and on desktop (since it was easily clickable/tappable). Please bring this back (or offer something similar). Tags in general seem great, but no need to eliminate the stars.
User would use it the same way they did before removal-- tapping or clicking the star to "save" the thread (or remove it from being saved)