Use Change Bow Origin to adjust the placement of a bow's origin within or in
relation to the origin cell.
Steps
In the Bows tab of the Bows and Braces dialog choose Change
in the Bow Origin panel.
Choose new values for the vertical or horizontal position
of the bow origin. The values represent percentages of the cell's height and
width. To place the bow origin outside the cell you may choose negative values
or values greater than 100%.
To use the chosen placement for every new bow you create,
check the Default box