You can revert a story that you have published to being unavailable to others by unpublishing it.
Do the following:
From the app overview, click to view the stories.
- Find the published story under Published by me.
Right-click/long-touch the story and select Unpublish.
The Unpublish story dialog appears.
The story is unpublished and moved from Published by me to My stories.
The story is no longer available to other users of the app.