Originally Posted by Aurora
I thought it always took everything you see, but it cropped people and I tend not to crop heads when I frame, unless I shook downwards
Ah, I think you have been hit by the lack of parallax correction - since you don't see through the lens there is a difference in view point and it matters most for subjects near the camera. RF cameras with more sophisticated viewfinders have corrections for this, e.g. moving frame lines.
Failing to compensate for the parallax error may give framing like this:
(In this case the turret finder actually has a correction for parallax error, but, alas, I didn't remember to use it.)