You have the possibility to manage your ebay message folders. To display the messages in your own folders, select a folder from the Messages folder ⇒ folder. The messages are displayed on the right.
If you want to edit your own folders, click on the button at the bottom of the message list. The following window will open:
Here you can create new folders, delete folders and rename folders.
If you have edited your folders on ebay, you can synchronize them with dewabit by clicking on the synchronize icon in the upper right corner.