The Content Scheduler Space is created by the Content Scheduler app during the installation. This Space is used to store the scheduled content temporarily until the content is published.
Since this space isn't intended to create any own content within, the following warning message will be displayed if the users tries to create content. If the user needs to create content within this space, the message can be closed.
Properties of this space
The default SpaceKey of this Space is SCHED. If this space key has already been used, a numeric counter will be added to this key.
Name of the space
The name of the space is Content Scheduler.
You can't see the Schedule button in the editor because new content cannot be scheduled in this space.
During the initiation of this space, specific space permissions will be applied based on the current Global Permissions of Confluence.
For a default Confluence instance, it looks like this: