Here is a copy of the Preferences 1 screen babarton mentioned. I've highlighted the appropriate selection with a red banner. The screen shot and description below are from the online manual.

Quote:
At program bootup... - When the new session starts, Band-in-a-Box can automatically open the song or style that was used in the last session.

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Jim Fogle - 2024 BiaB (1111) RB (5) Ultra+ PAK
DAWs: Cakewalk by BandLab (CbB) - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home