Rotate, Move, Zoom:

From the list fields select which mouse button will contain the functions Rotate, Move, Zoom.

In the list field under key, you can optionally combine the mouse action with a key combination (Alt, Caps, CTRL). If not , leave it "-".

Zoom:

Mouse movement upwards enlarges.

Mouse movement downwards minimizes.

If you activate Invert the opposite comes into effect.

Window:

Enlarge by pulling open a frame.

Mouse wheel: (click, pull, release)

With the Mouse wheel you can zoom in/out. Scrolling down minimizes the picture. If you activate Invert the opposite comes into effect.

Mouse wheel: ("normal" click on part)

Makes part transparent.

No settings options here.