If you want to zoom within your project, simply use the zoom percentage option at the bottom of the screen. Alternatively, you can also use pinch-to-zoom, by touching two fingers on the touch screen or touchpad and moving them apart to zoom out, or together to zoom in.
You can also use '+' and '-' on your keyboard as shortcuts, or 'Shift' + 'Scroll up or down.'
There are two ways to navigate within your projects:
Using a mouse
(Hold spacebar + drag mouse cursor)
For this to work, your cursor must be on the black or white background, rather than on one of the screens.
For some computers, you can use two fingers to swipe on your trackpad, which will make the canvas scroll in the direction desired.