The Extent pane determines the width of the bar marker.
Inner — Set this value to an integer from 0 to 100. The inner value is the distance from the left side of the Linear gauge to the start of the bar.
Outer — Set this value to an integer from 0 to 100. The outer value is the distance from the left side of the Linear gauge to the end of the bar.
Start — Set this value to an integer from 0 to 100. The start value is the starting value for the bar marker.