Use the options on the Solids > Change View menu to specify which action (rotate, move or zoom) you want PartMaker to perform when you use the left mouse button in the Solids window.
Rotate — Use this option to rotate the model using the mouse. This is the default option.
Move — Use this option to move the model using the mouse. Alternatively, you can press down the mouse wheel and then drag the mouse to move the model.
Zoom — Use this option to zoom in and out of the view displayed in the PartMaker window using the mouse. Alternatively, you can use the mouse wheel to zoom in and out.