Hi Guntis,
You can manage your files on the Acrobat.com cloud by accessing it in a web browser at https://files.acrobat.com. The web client supports all file management operations, including delete, rename and folder organization. We are still working on providing this capability in the mobile version and hope to bring it out in future updates. Until then, the web client can help you clear up your Acrobat.com space.
Thanks
Shradha