This article runs through the manage space options modal.
Space Name: Allows you to set the name of the space you are currently using
Space Route: Allows you to change the URL for the space. I.e having home here will change the route URL of your space to yourdomain/Home
Default page: Allows you to change the landing page.
Security Policy: Allows you to choose whether the space is public to your users or private and be invite only.
Add a user: Allows you to add an already invited user to the space.
Lists: Shows you your lists whilst allowing you to create/edit your lists.
Delete Space: Allows you to delete the space.