Show Sheet
Displays sheets that were previously hidden with the Hide Sheets command. Select one sheet only to call the command. The current sheet is always selected. If a sheet other than the current sheet is selected, you can deselect it by pressing Command Ctrl while clicking the corresponding sheet tab at the bottom of the window.
Hidden sheets
Displays a list of all hidden sheets in your spreadsheet document. To show a certain sheet, click the corresponding entry on the list and confirm with OK.