What is the editor zoom?
The editor zoom allows you to magnify the view in the editor to a higher degree than the default view. This is particularly useful when you need to work on designs with fine details. With the editor zoom, you can zoom in on specific areas of the design and make adjustments with greater accuracy.
Usage
Use your mouse wheel or attached trackpad to zoom in towards where your mouse pointer currently is.
You can also press the mouse wheel down in order to pan around in the current zoom level you are at.
link Show the zoom bar usage