Sure, I can help you with that! Here's how you can unhide multiple rows in one go:

1. First, select the rows above and below the hidden rows. For example, if rows 21-35 are hidden, select rows 20 and 36.
2. Right-click on the selected rows and choose "Unhide" from the drop-down menu. This will unhide all the rows in between the selected rows.
3. If there are still hidden rows that you want to unhide, repeat steps 1 and 2 until all the hidden rows are visible.

Alternatively, you can use the "Find and Replace" feature to unhide all the hidden rows at once:

1. Press "Ctrl + F" to open the "Find and Replace" dialog box.
2. Click on the "Options" button to expand the dialog box.
3. In the "Find what" field, type
   Code:

   "."

   (Note: This is a period, without the quotes. This will select all cells in the worksheet.)
4. Click on the "Find All" button. This will select all the cells in the worksheet.
5. Right-click on any of the selected cells and choose "Unhide" from the drop-down menu. This will unhide all the hidden rows and columns in the worksheet.