Who can use this capability
Only sheet owners can recover deleted sheets.
Recover a deleted sheet
If you're the owner of a deleted sheet, you have up to 30 days to recover it; after that the sheet will be permanently deleted.
Recover a deleted item
You can't recover deleted workspaces or folders—you'll need to rebuild them.
On the left Navigation Bar, click Browse.
Scroll to the bottom of the Browse panel and then click Deleted Items.
Right-click the item and select Undelete. Recovered items move back into your Sheets folder.
You can also drag the item out of the Deleted Items section and drop it in a folder or workspace to undelete it.