The page title shows up on my website and I can't get rid of it. The page title selector said it would hide if header is h1 on some themes. I am using the child theme of generatepress wplms that you sent.
Each theme handles page builder compatibility differently. For example, the Astra Theme will automatically know when you are using a page builder and make the adjustments for you.
Elementor has a feature where it will try to automatically do it for you, but it's not perfect and requires knowing a bit of CSS.