I’ve known for a while that the Greek and Hebrew texts can be opened as a regular project in Paratext as well as the usual way of opening them in the Source Language Text. Today, thanks to anon044949 , I’ve discovered a reason why some users may want to do that.
It has to do with the apparatus, the specialized footnotes in the Greek text that reflect textual notes or variants in manuscripts. In the Source Language Text window, you can see these as popups when you click on the red superscript letter. But this only shows one note at a time. If a consultant or exegete would like a broader view to see the apparatus for a whole passage, they can open the Greek as a regular project, then press F7 (or go to View > Show footnotes), and will see all the apparatus notes for whatever verses are on screen.