When Viewing Type is Scale to Fit, the program automatically controls the scaling factor to fit all visible objects in the available space.
When Viewing Type is Scale or Screen Scale, do any of the following to change the scaling:
Under Scale Type click Ratio, then in the Scale text box type the ratio between modeling units and units on the page (for example, 2:1 or 1:100). For actual size type 1:1.
Under Scale Type click Percentage, then in the Scale text box type the percentage of modeling units to use on the page. For actual size type 100.