In previous versions of Premiere, if you entered rolling trim mode, you were able to use the alt/option + L or R keys to indefinitely extend or shorten the edge of that clip, even if it wasn't next to another clip on the timeline.
In the most recent version of Premiere (23.1.0), it appears that functionality has been removed. alt/option + L or R still works to trim edits between two adjacent clips, but if only a single edge of a clip is selected, e.g. not adjacent to another clip, using the alt/option + L or R keys exits trim mode after trimming a single frame.
This is driving me crazy. It appears this functionality, which I used all the time, has simply been removed. It IS possible to recreate a similar effect by toggling through trim modes before using alt/option + L/R, but it adds an extra step, and is dangerous - accidentally toggling to ripple trim and trimming messes up sync in my timeline.
Adobe, can you please restore this functionality? I can't see why there would have been any reason to remove it, it appears it hasn't been replaced by a different function or anything, just taken away.