I remembered reading this going through the manual. Here it is:

From Page 10, Chapter 1: Welcome to Band-in-a-Box!, 2019 Band-in-a-Box Mac User Manual.

"The Preferences you set in the program are saved in the Preferences folder, and this folder also has a file named Intrface.BBM with all the program settings including MIDI and audio driver setup. If this file is removed to the trash the program will open like a new installation the next time it runs. It will prompt for all initial setup selections. This is useful as a “global reset” if there are system settings that have been changed by accident."