The touch area is a transparent element to which events can be assigned. It works similar to a hotspot in InDesign; in other words, an event is assigned to a touch area instead of an element directly. The touch area is situated over elements or Compositions. It is presented as a red interface for easy editing on the stage of Purple DS Composer.
The touch area is helpful for editing PDF documents, since it can be used to quickly amend interactive elements. This allows you to place a touch area in the text using the " open URL " event.