Mouse View Controls
You can use your mouse buttons to quickly manipulate the model view.
Click to select or perform most other actions on the model.
Right-click and drag to rotate the model. Left-right direction rotates the YX plane around the Z (up) axis (default orientation). Up-down direction rotates the positive Z-axis perpendicular to your screen.
Double-click the middle mouse button to reset the rotation to front view (i.e., view from the negative Y-axis).
Click-and-drag the middle mouse button (scroll wheel) to pan the model in the view.
Scroll up or down using the scroll wheel to zoom in or out, respectively.
Hold <Ctrl> while scrolling up or down using the scroll wheel to increase or decrease the text size in the view window.