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The sheet is unpublished and moved from Published by me to My sheets.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