Landscape Mode issue on iPhone 6.

HOW DO I GET MY LANDSCAPE VIEW BACK ON MY IPHONE 6?

My phone was working fine with Landscape mode even when the Display setting was set on Zoom (i set this on my phone when i first activated it).

Couple of days ago i took my phone into Apple store to fix an issue with the ringer (I had to put callers on speaker otherwise i can't hear them and they can't hear me). Anyway, when i got my phone back (and i should checked it before i walkd away from the Genius Bar) i realized I couldn't get it to landscape mode--even on email or text window or Safari. I read on here to change the zoom and it didnt work. Ive had the zoom on before so I'm not sure if it has anything to do with the zoom. any ideas?