Those are two different causes shown in your graphic.

The blue are part markers. A measure can be blue (A), green (B) or no color. A few styles are multistyles and allow many more colors. I suppose you could create a dummy multistyle with the same patterns, and use that just for colors.

The red underscores are the indicator from BIAB that some editing of that measure was done by F5. You can press F5 on a measure and you will see that something was changed: the tempo, volume, muting of an instrument, the style, or many other possible settings.


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.