Comment out Page titles

Hello,

I am trying to hide titles so they do not appear as the first line of text on a page, since they are on the menu of my webpage.

I have searched this topic but can only find a solution referring to Page PHP.
However its not in this version seemingly…?

Is it in the style css?
Can someone please advise me which part I need to comment out and roughly where it is located.
Thanks in adavnce.