A little more detail on the rested chord (C.) after the held chord, which is what I recommend on a regular basis:

A held chord will sustain until the next chord you've entered, so if you put one on the last chord in the song, results will be unpredictable (BIAB hasn't been clearly told what you want). That's why we need to enter a rested chord after the held one. You'll sometimes need to make the song a bar longer so there's room for the rested chord before the end bar.

As long as this is done, your ending settings in Song Settings won't really matter, as playback will already be silent by the end of the song.

Cheers
Kent