How do I edit a category set?

To be able to edit a category set, you must first navigate to the corresponding page. To do this, click on Templates -> Category Sets in the left navigation bar. Select your desired category set there (tip: you can also use the search) and double-click on the corresponding line or alternatively on the pencil icon. Then click the "Assign categoies" button. Now another popup will open where you can see all available categories on the left side and categories assigned to your set on the right side. To add or remove a category, check or uncheck the box to the left of the respective attribute. When you are done editing, don't forget to click the "Save" button.