I ran into this issue as well and I am no pro but I did find a solution that worked for me.
I made a child theme. Then I went into my file manager and copied the page template to the child theme but with a different name. Back in WordPress Editor (beta), the new template showed up and I was able to customize it. I used it to create a page template that had no page title.
Someone else more knowledgeable than me probably has a much simpler solution.