From the Mammography
toolbar, click the Fit-to-breast button, 
.
Apply a calculated zoom factor to the selected image such that the anatomical structure in the image, e.g., the breast, is displayed as large as possible within the defined image frame. When applied, the anatomical structure will appear up to the edge of the image frame for the short of the two dimensions (width or height).
To apply fit-to-anatomy to a selected image, do the following:
From the Mammography
toolbar, click the Fit-to-breast button, .
This feature requires skin line detection to find the anatomical structure. If skin line detection is unavailable or fails, the feature applies the fit-to-image zoom factor.