My thinking on this is don’t choose a style just choose a realtrack from:
Choose a track after the last blue BIAB track and make it an Audio track
Go to the generate menu (top of page) and select and generate Realtrack chose from list of realtracks.

If you want to use a midi super track or harmony track etc choose that fro the generate menu.But in this case you must set the track type to midi.
BIAB2021 UltraPlus,AsusN55S1Tbssd, W10/64,Akai EIEpro
Yamaha CVP405,SquireStrat, CoolsoftVMidSynth
Novatation Impulse61 Ctr kbd, Cwalk blab Kontakt