Select the correct app, then open the browser toolbar. Its actions apply only to that app.
Choose Unpublish to take the published app offline without deleting its definition. This action changes publication state directly; it is not the same as discarding an edit.
After it completes, the action changes to Publish. Choose Publish to make the saved app available again. If you also have draft changes to release, use the Save workflow rather than assuming that toggling publication saves them.
