I tried that already, and nothing improved. My mana bar is cutoff as well as everything else regarding corners. From what I see, I'm not the only one with the issue.According to your profile you own pretty much every Terraria edition there is, but I'm guessing this is an Xbox One issue. Have you tried:
- Try changing output mode from Autodetect/HDMI to DVI in your Xbox Settings>Display & sound>Video output>Video fidelity & overscan.
Then restore resolution to 1080 (it gets reset to 720).