Zooming the canvas
The toolbar of the model editor indicates the current zoom percentage for the canvas. The zoom buttons in the toolbar allow you to
zoom out, which makes everything on the canvas smaller so that more items can be shown, and to
zoom in, which makes everything on the canvas larger, but less items can then be shown.
Note: When you use the key combinations mentioned below, the currently selected area defines what is to be zoomed. When the canvas has the focus (for example, when you have just selected a block or wire), only the content of the canvas is zoomed. When the documentation pane or the palette currently has the focus, the browser's zoom functionality is used and all of the browser content is zoomed (and the zoom percentage in the toolbar remains unchanged).
To zoom the canvas
To zoom out, click 
in the toolbar of the model editor. Or press Ctrl and the minus key.
To zoom in, click 
in the toolbar of the model editor. Or press Ctrl and the plus key.