What is the file you open in BiaB? Is it MIDI or XML etc?

You should be able to do this from the Lead Sheet window.

First, select the track that you want to show at the top.

Then, click on the [+] button and select the tracks in the order that they should appear from top to bottom. To remove an extra track from the display, click on that track name and select remove from the menu. To remove all extra tracks, click on the [+] button and select remove extras from the menu.

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