Describes the cause and action for error messages.
Error Message(English)：
spreadsheet missing tabs at bottom
What To Do When Worksheet Tabs Go Missing | AccountingWEB
https://www.accountingweb.com/technology/excel/what-to-do-when-worksheet-tabs-go-missing
How To Restore/Disappeared Missing Sheet Tabs In Microsoft Excel?
http://www.repairmsexcel.com/blog/recover-missing-sheet-tabs-microsoft-excel
Excel - Sheet tab missing (Solved !) - YouTube
https://www.youtube.com/watch?v=IDUSLt6LWc8
https://www.youtube.com/watch?v=IDUSLt6LWc8
How to Get Those Vanished Tabs at the Bottom of an Excel Workbook ...
https://www.journalofaccountancy.com/issues/2010/feb/techqa1.html
How to display or hide sheet tabs and Sheet Tab Bar in Excel?
https://www.extendoffice.com/documents/excel/672-excel-hide-display-sheet-tabs.html
How to Show and Hide the Worksheet Tabs in Excel
https://www.howtogeek.com/218611/how-to-show-and-hide-the-worksheet-tabs-in-excel/
How to Show Missing Worksheet Tabs in Excel 2013 - Solve Your Tech
https://www.solveyourtech.com/show-missing-worksheet-tabs-excel-2013/
MS Excel 2010: Unhide a sheet - TechOnTheNet
https://www.techonthenet.com/excel/sheets/unhide2010.php