Removing Post Titles

I have a question about removing post title pages and am using the Volume template from the Site Library and I think that is preventing me from removing titles on posts. My featured image already has the the title of the post in it so having the post title appear is redundant. I tried the code above as well as the disable elements radio button when editing a post.

I see this:

<h1>
{{post_title}}
</h1>
This is found under: Appearance>Elements>Single Post Header

I’ve tried removing {{post_title}} from the above. Prior to deleting, the title would appear on top of the featured image. After deleting, the title appears below the featured image. Any help would be great, thank you.