How to make the image size in the preview pane bigger?

Hello

1. I'm having a problem getting the image shown in the preview pane to the fixed size, it used to fit automatically as I changed the size of the preview pane but now it gets as big as it shown bellow no matter how much I move the edge line. it's only in SW files.

This problem began since I upgraded to SW2015. How can I fix this?

2. Another old problem: sometimes the preview doesn't show to part/assembly. It shows a Solidworks icon instead.

I would be happy for any help.

Thanks

Amram

SolidworksGeneral