Describes the cause and action for error messages.
Error Message(English)：
cannot see row numbers
How to Show and Hide Row and Column Headers in Excel
https://www.howtogeek.com/220829/how-to-show-and-hide-row-and-column-headers-in-excel/
Why Are Row Numbers Missing in Excel 2013? - Solve Your Tech
https://www.solveyourtech.com/row-numbers-missing-excel-2013/
Displaying a Hidden First Row (Microsoft Excel) - Excel Tips - Tips.Net
https://excel.tips.net/T002743_Displaying_a_Hidden_First_Row.html
When unhide row doesn't work… | wmfexcel
https://wmfexcel.com/2014/04/01/when-unhide-row-doesnt-work/
Excel - How to display row numbers on the right side - Super User
https://superuser.com/questions/1199602/excel-how-to-display-row-numbers-on-the-right-side
Unhide the first column or row in a worksheet - Excel - Office Support
https://support.office.com/en-ie/article/unhide-the-first-column-or-row-in-a-worksheet-d6b47608-80ee・・・
Print row and column headings - Excel - Office Support - Office 365
https://support.office.com/en-us/article/print-row-and-column-headings-de41db7e-b716-4d8b-a5fd-5fb50・・・
Excel Troubleshooting: The Gridlines are Missing - YouTube
https://www.youtube.com/watch?v=KbglByW-pMw
https://www.youtube.com/watch?v=KbglByW-pMw