The example below shows the 3 types of stand lines you can reset.
Visibility
Select the stand(s) you would like to reset then click the 'Reset Lines' button which is located on the Dynamic ribbon.
NOTE: The Dynamic ribbon will not appear if you have entities other than stands selected, to deselect the other entities and only select stands, press F3 twice.
The following dialog will now appear.
Select the stand lines types you would like to reset then click OK.
Your stands lines will now be reset as shown below.