1. Open the Properties dialog.
2. Select the 'Symbology' tab and the 'Return Combination' tab within it.
3. Click on a category or set of values.
4. Click the "Remove Value(s)" button to remove the selected category.
1. Open the Properties dialog.
2. Select the 'Symbology' tab and the 'Return Combination' tab within it.
3. Click the "Remove All Values" button.