From the Edit menu, select Current Display Settings. The Edit Current Display Settings dialog box appears.
Click the Scroll Rates tab.
In the Regular Scroll Rate field, enter the normal scroll rate.
Select a unit for the regular scroll rate from the Scroll Rate Unit buttons. For example, to set the scroll rate to minutes, select the Minutes button.
In the Fast Scroll Rate field, enter the fast scroll rate.
Select a unit for the fast scroll rate from the Fast Scroll Rate Unit buttons. For example, to set the fast scroll rate to hours, select the Hours button.