How to retrieve missing rows in calc

I have noticed missing rows in my calc documents. Is there a way to retrieve or find them. I am using version 6.4. Missing rows might be between 15 and 35 rows depending on the file. Is there something I’m doing to hide or delete these rows inadvertently?

Thanks for your help.

If the row titles (the column with numbers to the left of column A) show a number gap (e.g.: 1, 2, 3, 9, 10, 11):

  • drag from the previous row title until the next row title (e.g.: from 3 to 9), then with secondary click, choose Show Rows; or
  • place the cursor on row 3, press Shift+Arrow Down, and choose menu Format - Rows - Show.

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Worked perfect. Thanks for your help.