Learn how to pan, zoom and scroll in the viewport.
Click and hold the middle-mouse button to pan the view.
If you have a trackpad (such as on Mac), simply scroll in the direction you'd like to pan.
Hold Control or Cmd on Mac while scrolling to zoom the viewport.
If you have a trackpad (such as on Mac), you can use two fingers to pinch-zoom the viewport.
Scroll content inside a ScrollView
A lot of times, content may be hidden inside of a ScrollView. To scroll inside of a ScrollView, hold the ALT key while scrolling normally.
Resizing the viewport
Simply drag any side of the viewport to the desired size.