Okay, first things first ...
Okay ... basic Bryce 101
There's a tiny thumbnail in the upper left corner.
1. any way to make that larger?
2. There's a 'part' of the thumbnail that displays large on the screen. There's a "-" and "+" which will have either this enlarged part displaying OR the entire thing rather small in the centre of a huge gray space.
How to get the displayed image to be showing all what's in the thumbnail, filling the view pane?