The buttons in the Zoom toolbar found in the Symbol Editor are described below.

Button Description
Zoom In button. Magnifies the elements on the workspace.
Zoom 100% button. Displays the items in the workspace at their normal viewing size. This is the size that they will be displayed at in Multisim. When the Symbol Editor first opens, the magnification is set to 200%.
Zoom Out button. Reduces the viewing size of the element(s) on the workspace.