Welcome to the forums parisslim! This is a known bug in Mac Big Sur itself that is also affecting other programs in addition to Band-in-a-Box. Out development team is working on a solution to this issue.

It has also been discussed in this forum thread: https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=655356#Post655356


Best,
Chantelle