Probably old news to some, but I thought I'd share this fortuitous discovery today. I was using the Parallel Gospel Reader and clicking away to explore buttons and discovered this:
As you know harmonies can be a real pain to navigate because canons use different approaches and judgments to organize the material and any given gospel is chopped up among sections. This neat little gem hiding away (highlighted in yellow) allows the user to reorganize the canon according to the gospel you choose. Now you can go through Luke (or any of the three other gospels) sequentially if you want to and see what passages in the other gospels are parallel to it.
The help file states: that the tool "allows the entire synopsis to be reordered by one of the gospels at will (eg, “I want to see only Matthew and Mark, in Markan order”)" but it does not tell or show you how. That's how.