Welcome! This one could take a bit of explaining, since each of us may do it differently. First, you can make your own ending instead of accepting the built-in 2 or 4-bar ending BIAB provides by default. Go to Song Settings (Ctrl+N) to see some options in the lower left corner.

I often like to turn off the built-in ending and hold a chord at the end. You can do this easily by typing three periods at the end of the chord, ex. D7...

If you use a hold, make sure to set the ending bar well after it. This can be done by Bar at End of Chorus on the main chord screen, or by the options in the Tag if you use one (also in Song Settings).

If the bass plays the wrong note on an ending chord, force it by using slash root chords, ex. D7/G forces a G in the bass.

There's more, but let's start with that.

BIAB 2024 Win Audiophile. Software: Studio One 6.5 Pro, Swam horns, Acoustica-7, Notion 6; Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus Studio 192, Presonus Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors