Select the rows you want to hide
Right-click the selected row headers
Click Hide
Use the Home tab
Go to Format
Select Hide & Unhide
Click Hide Rows
To hide non-adjacent rows, hold Ctrl and select each row header before hiding
To hide a row using a keyboard shortcut, select the row and press Ctrl + 9
To unhide rows, select the surrounding rows
Right-click the selected row headers
Click Unhide
Or use Home
Go to Format
Select Hide & Unhide
Click Unhide Rows