The Zoom In and Zoom Out options are in the right upper corner.
You can also click on the + or – signs to change the magnification. Click + to focus on a specific part of your document. The – option will allow you to see more of your document at once.
You can also use the shortcut combination Ctrl + upward mouse scroll to zoom in and Ctrl + downward mouse scroll to zoom out.
Alternatively, right-click anywhere on the document while the View mode is ON and select the Zoom In/Zoom out option in the context menu.
The Percentage indicates the current level of magnification. When the document is at 100% it will be the actual document size. Click the arrow to choose another percentage from the dropdown menu.