Describes the cause and action for error messages.
Error Message(English)：
tabs missing after saving
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
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 Get Those Vanished Tabs at the Bottom of an Excel Workbook ...
https://www.journalofaccountancy.com/issues/2010/feb/techqa1.html
Worksheet tabs disappear when you change some "Display options ...
https://support.microsoft.com/en-ca/help/928989/worksheet-tabs-disappear-when-you-change-some-displa・・・
Excel Pages are Missing - bioPDF
http://www.biopdf.com/guide/missing_pages_in_excel.php
Data Disappears in Excel - How to get it back - Stellar Data Recovery
https://www.stellarinfo.com/blog/data-disappears-in-excel-how-to-get-it-back/
Turning Off Worksheet Tabs (Microsoft Excel) - Excel Ribbon Tips
https://excelribbon.tips.net/T007359_Turning_Off_Worksheet_Tabs.html