There are two ways to select the hatch boundary:
Clicking as shown below hatches region A:
When an object is selected, the Create Hatch toolbar is displayed and a boundary is selected.
When Turn left at branch mode is selected on the Create Hatch toolbar (default), you can select the complete hatch boundary with one mouse click.
button on the toolbar. The selected hatch pattern is added to the selected region.
To edit the hatch boundary, use the Create Hatch toolbar. This toolbar is used in the same way as the Composite curve toolbar.
When you have created the hatch, you can edit the hatch.