Now that you have a basic understanding of the user interface, we’ll move on to the basic functions of the viewports. A viewport can be zoomed by holding down the Shift key and the left mouse button and dragging the mouse vertically. It is important to note that zooming will not work if the Select button under the Model tab is selected. If the viewport is 3D, holding down the Shift key and the left mouse button will rotate it in a 360-degree arc. The viewport can also be panned by holding down the Ctrl key when the left mouse button is selected and dragged.