Clicking and holding on the first three icons allows you to pan, zoom, and rotate the viewport. These camera adjustments can also be accessed via your keyboard by holding down 1 (Pan), 2
(Zoom), or 3 (Rotate) as you click-and-drag with the mouse. If holding down 2 or 3 to zoom or
rotate, you'll notice that the previous position of the mouse cursor is replaced with a crosshair. This represents the anchor point for your camera movement. If we hover over the top-right corner of our cube, press 2 on the keyboard and move the mouse, we'll zoom in to that corner. If the mouse is not hovering over an object, the anchor point defaults to our background, enabling faster, world-oriented camera movement. You can also navigate using the left, middle, and right mouse buttons while holding down the Alt (Windows) or Option (Mac) key.