Selecting the Hatch Index
This is done via the Annotation Menu › Pick Index from Hatch

Select the hatch pattern to delete (click on the hatch with the mouse cursor)

After clicking on the hatch, the hatch index will be displayed, as shown above.
Click OK to continue
Using Selection Filters
The next step is to use selection filters to select the hatch patterns defined by the hatch index
This is done via the Edit Menu › Selection Filters...

Select the Properties Tab on the Select dialog and make the following changes:

Drag a box over the entire drawing, using the mouse cursor (click on the top left hand corner, with the left mouse button pressed, drag a box to the lower right corner, the hatch pattern/s will be selected).
Changing the Hatch Pattern
Select a new hatch pattern.
This is done via the Annotate Menu › Enter Hatch/Solid Fill
Select a new Hatch Pattern, the hatch patterns can be viewed by clicking on the PreView patterns button.

Once the selection has been made, click on the Apply button.

In the Apply What? dialog, you have the option to change All or only the style, pen or scale of the Hatch Pattern.
Click OK once the selection has been made.
All the selected Hatches will now be updated to the new Hatch Pattern.
NB: Once you have modified the hatch, make sure that the Selection Filters are reset. This is done by clicking on the Objects Tab on the Select dialog and then pressing the Filter Reset button.

Click on the Close button once reset.
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