Editing the Hanger/Riser spacings allows you to set the header panels in the item grid to the values you want. There are several ways to access the editing screen:
Right-click Round, Rectangular, or Duct Board Rectangular in the tree and select Edit Hanger Spacing.
Select Edit > Edit Hanger Spacing.
The Edit Hanger/Riser Spacing window will appear.
Enter the values you want for your spacing and use the drop-down arrows to select the unit of measure for those spacings. When you are finished making your changes, select OK. If you want to abort your changes, select CANCEL.