But only for real / audio instruments. MIDI instrument endings are controlled within the style editor / Endings grid. I don't think they decay the way that Real Tracks do.

Per the manual
By “4-bar-endings” we are referring to a 2-bar ending that has an additional two bars to allow for the natural decay of the audio instrument (instead of being quickly faded out).


BIAB for Windows Version 2019 (643)
Windows 10 (1909)