Mockitt design tool is an infinite canvas, which can be infinitely extended in any direction, and you will have absolute freedom to plan your own creative area.
Zoom the Canvas
The Zoom feature is placed on the right side of the toolbar and you can click on the zoom scale expansion menu in the upper right corner of the editing area.
And there are several options:
Zoom in (shortcuts: ⌘ + / Ctrl +)
Zoom out (shortcuts: ⌘ - / Ctrl -)
Zoom to fit (shortcuts: ⌘ 1 / Ctrl 1)
Zoom to selection (shortcuts: ⌘ 2 / Ctrl 2)