Panels and dialog boxes use the measurement units and increments defined in the Edit > Preferences > Units & Increments (Windows) or InDesign > Preferences > Units & Increments (Mac OS) dialog box. However, you can specify values using any of the supported measurement units at any time by temporarily overriding the current preference settings.
Type a value in the box, and then press Enter or Return.
Drag the slider.
Drag the dial.
Click the arrow buttons in the panel to change the value.
Click in the box and then use the up or down arrow keys on the keyboard to change the value.
Select a value from the menu associated with the box.