If you use the mouse wheel, the wheel zooms in and zooms out by default. To zoom into a page, push the scroll wheel away from you; to zoom out you have to drag the mouse wheel toward you. If you don't want to use the mouse wheel for zooming, you can change the settings and use it for scrolling: click Tools => Options => in the list of categories, click Workspace => click Display; to specify the default action of the mouse wheel, choose Zoom or Scroll from the Default action for mouse wheel list box (see the image below).
When one of the Pan or Zoom tools is activated you can zoom out by clicking the right button of the mouse (this is the default action). However, if you want to use the right button of the mouse to display the contextual menu (as it is customary when any other tool is activated) you can change the default settings from the Options dialogue box (CTRL+J or click Tools => Options). In the list of categories click Workspace, double-click Toolbox, and click Zoom, Pan tool. To specify the action of the Zoom or Pan tool when you right-click in the drawing window, enable one of the following options:
Zoom out — zooms out by a factor of 2
Context menu — displays a menu of commands that let you zoom to a specific level
When one of the Pan or Zoom tools is activated you can zoom out by clicking the right button of the mouse (this is the default action). However, if you want to use the right button of the mouse to display the contextual menu (as it is customary when any other tool is activated) you can change the default settings from the Options dialogue box (CTRL+J or click Tools => Options). In the list of categories click Workspace, double-click Toolbox, and click Zoom, Pan tool. To specify the action of the Zoom or Pan tool when you right-click in the drawing window, enable one of the following options:
Zoom out — zooms out by a factor of 2
Context menu — displays a menu of commands that let you zoom to a specific level