The scale control indicates and sets your current stylization scale. The list includes all the scale ranges (for feature data) and thresholds (for drawing data) defined in the current map. If you link scale to zoom, styles update appropriately as you adjust the zoom, and zoom updates when you select a scale. If you use the custom scale box, the correct style is applied based on where the custom value lands within the scale ranges and thresholds.
To set the map scale
To set map scale for a paper space viewport
. The map zooms to the new scale ratio when you exit the dialog box.
. Use the Scale Bar Properties dialog box to change the scale ratio to the next whole integer.