Describes the cause and action for error messages.
Error Message(English)：
unable to show workbook
Hide or show worksheets or workbooks - Office Support
https://support.office.com/en-ie/article/hide-or-show-worksheets-or-workbooks-69f2701a-21f5-4186-87d・・・
What To Do When Worksheet Tabs Go Missing | AccountingWEB
https://www.accountingweb.com/technology/excel/what-to-do-when-worksheet-tabs-go-missing
Excel won't show the workbooks worksheets - Stack Overflow
https://stackoverflow.com/questions/14691277/excel-wont-show-the-workbooks-worksheets
Why Can't I See My Worksheet Tabs in Excel 2013? - Solve Your Tech
https://www.solveyourtech.com/why-cant-i-see-my-worksheet-tabs-in-excel-2013/
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 Recover Missing Sheet Tabs | Microsoft Excel 2016 Tutorial ...
https://www.youtube.com/watch?v=I2NWBjsi1kA
https://www.youtube.com/watch?v=I2NWBjsi1kA
How To Restore/Disappeared Missing Sheet Tabs In Microsoft Excel?
http://www.repairmsexcel.com/blog/recover-missing-sheet-tabs-microsoft-excel
Why can't I see my worksheet tabs at the bottom of my spreadsheet?
https://it.toolbox.com/question/why-cant-i-see-my-worksheet-tabs-at-the-bottom-of-my-spreadsheet-051・・・