So after some more playing I figured it out
-I kept my normal "Extended Display" option through my Windows Display Settings.
-I >restored< the DarkBasic Pro Compiler Window
-I drag-sized the restored window to fit both screens.
-I right-clicked the desired file's tab and selected "New Vertical Tab Group"
The File was then split off into a side-by-side display across both screens. With minor adjusting, it was perfect! I can even add visibility on additional File tabs this way.
Cheers!
Edit: Extra bonus is that the compiler stays up on my 2nd screen, so I can just run my mouse to that display and click to bring my compiler back up on both screens. Quite convenient!
Ask not for whom the bell tolls;
It tolls for ye!