Open the page in the editor, go to the upper right and click on the screen options tab, then click to activate “discussion”. Now scroll down below the text area to the “discussion” module and disable comments and trackbacks and then click the update button to save the changes.
Thanks very much @thesacredpath! I’ve been trying to figure that out for the past 40 minutes and was completely stumped! It didn’t even dawn on me that the discussion section would be hidden until finding this thread :)