Hi Lesley,
Thank you for sending the file. It helped a great deal.
The problem arises because you have a part marker every two bars and BIAB is set to break to a new line when part markers are involved.
This is normal behaviour and can be verified by deactivating the "New line for every section" found in "Display Options" (see graphic below).
To get more bars viewed on the screen while keeping the "New line for every section active", one approach would be to...
1. When the part markers are in place at every two bars, generate the song.
2. Now freeze all tracks.
3. Remove the blue part markers, except for bar 1 which is always present.
Because the tracks are frozen after generation and before the part markers are removed, the part markers will still play even though they are not present on the score.
Regards,
Noel