How to Check What's Where (Layer-wise)?

DVD Studio Pro, latest version. New MacPro.

Reviewed posts, articles, manual. Successfully created a test DL video DVD, OTP. It worked great on a bunch of typical DVD players, an XBox, a computer.

The test is for a project to finish ASAP-- a feature length documentary plus 4 short films as extras, each asset on its own track.
--There are no Chapters (more precisely, there is one chapter per track).
--The simple menu offers a button for each item.
--The feature asset is 3.4GB and the extras are altogether about 2.6GB.

I could not figure out how to specify which asset goes on which level, but I did follow advice on the Cow: build the job with break set to Automatic, check the Build & Format window's Disc/Volume tab, Layer Break pulldown.
Listed in the dropdown is:

"Track 1::Track 1"

and,

"Automatic"

Does this mean the complete feature asset (which is located on Track 1) is on level 0? That would be cool.
I want the feature on level 0 and the extras on level 1; this strategy is so the break isn't in the middle of one of the extras.
Is there a way to check where the break happened?