I’m first waiting for it to be muted, and then try to undo it. I thought I read somewhere that this is necessary to do it, maybe it was this post, idk: Aeros: How to clear a 6x6 Track? - #2 by Euan, Aeros: How to clear a 6x6 Track? - #12 by Euan
But apparently muting is not needed after all, as explained here: Deleting track or part - #11 by meadowbrook
The last part of a song can be deleted by pressing the last part’s icon and a pop-up will ask if you wish to delete it.
But only after stopping the loop unfortunately