To store attachments and permissions, Refined uses a special space called Refined Layout Space. Do not remove or edit this space: it is essential for the functioning of Space Layouts and User Dashboards. Under normal circumstances, you don’t need to interact with this space. That’s why it is archived and hidden from the regular places where you’d list spaces.
In most cases, you can reach it via http://yourdomain.com /display/rwlayoutkey
If for whatever reason that key was taken when the space was created, it might live under a different key. In that case, you can find it by:
Navigate to Refined Administration > Layouts.
Under Space Layout, scroll down to Global Space Layout and click the Edit button.
You’re now presented with an information box. Click the link to go to the Refined Layout Space.