Thank you all so much. I had to ask because I performed "Apply trimming" and it didn't help. The track in question is Track 3, and it was selected as the only one (in other words, not multi select). And yet it still wrote to disk with the max length.
One thing I could double-check is that even though I highlighted the track number to select, it may not have
actually highlighted the clip itself - that happens to me at times.
Other than that, I'll read the reference manual on exporting, but so far this thread is telling me to know more about
slip-editing, and Edit/Select by Time.
I'll see what happens! Again, thanks so very much.