Sheet Navigator, will open a sidebar listing of all the sheets in the spreadsheet.
Sheet Navigator creates a nice sidebar with a table of contents like listing of all the sheets in your spreadsheet.
You can choose to toggle the visibility of hidden sheets.
It will indicate whether the sheet is protected or hidden.
Best of all it allows you to easily filter and sort the sheets so that you are only looking at the ones you want to see.
You can duplicate, rename or delete a sheet.
This tool is a must for spreadsheets with many sheets.