Sometimes you will look forward, but the screen will seem off-center. An easy fix for this is to press and hold your Oculus button.
This is the button on your right hand controller that is “depressed” instead of “raised”. That way you can feel for it instead of needing to look. (I tend to peek out of the space where my nose is sometimes)
Another tip for this button: If you are playing a game and feel like everything is too close, you can just lean your head forward and then hold the Oculus button again. It will not only re-center you left and right, but also “push back” whatever was in front of you.