Hi,
if you are on the viewlog (not sure if you are getting this problem on the live view or on the viewlog) , you need to go on the camera adjustment (not sure if i can recall it correctly, but there is an option about the afjustment or settings) and you will find a red circle line. You need to enlarge that line so that you can increase your field of view.
You can enlarge it by pointing your mouse on the edge of the circle and drag it/pull it, outside the circle to enlarge it.