There are a few ways to unhide rows in Excel. The easiest way is to click on the "Unhide" button on the "Home" tab. This will open a dialog box where you can select the rows you want to unhide.

Another way to unhide rows is to select the rows you want to unhide and then press Ctrl+Shift+U.

A third way to unhide rows is to use the Excel VBA code. To do this, you first need to open the Visual Basic Editor. To do this, press Alt+F11. In the Visual Basic Editor, go to the "Project" window and select "ThisWorkbook". Then go to the "Code" window and paste the following code:

Sub UnhideRows()

Dim i As Integer

For i = 1 To 10

Sheets("Sheet1").Rows(i).Hidden = False

Next i

End Sub

This code will unhide the rows from 1 to 10. You can change the number 10 to whatever number you want.

To run the code, press F5 or go to the "Run" menu and select "Run".