What you type is what you get, including spaces: Preformatted Block – Documentation – WordPress.org

Examples:

  _______             ___  __            
 / ___/ /__ _    __  / _ )/ /__  ___ ____
/ (_ / / _ \ |/|/ / / _  / / _ \/ _ `(_-<
\___/_/\___/__,__/ /____/_/\___/\_, /___/
                               /___/     

  _   _   _   _     _   _   _   _   _  
 / \ / \ / \ / \   / \ / \ / \ / \ / \ 
( G | l | o | w ) ( B | l | o | g | s )
 \_/ \_/ \_/ \_/   \_/ \_/ \_/ \_/ \_/ 

  ___| |                 __ )  |                  
 |     |  _ \\ \  \   /  __ \  |  _ \   _` |  __| 
 |   | | (   |\ \  \ /   |   | | (   | (   |\__ \ 
\____|_|\___/  \_/\_/   ____/ _|\___/ \__, |____/ 
                                      |___/