When you insert a door in a design plan, you should see the below dialog box appear which gives you the option to change door handing from left to right and vice versa.
If you wish to make changes to the door handing after the door has already been added, please follow these steps:
1. Select the door.
2. Once the door is selected, click on the Items tab. In the Attributes column, you should see the option to change the door handing.
If you wish to define the handing before adding the door, please follow these steps;
1. Click on any Criteria Add Criteria Handing.
2. After the handing criteria has been added, you should see the "Handing" option available in the Catalogue Items box.