Cannot remove or format page title on page body

My theme (Hashi) insists on putting the page title at the top of the page body text. I want to do my own titles, and not have the theme duplicate the title. My preference is to remove the automatic title, and I have tried to comment out every line in page.php that says “print” but the stubborn title still shows up on the page body. I could live with being able to format it to my own liking, but cannot seem to do that either. I have created a child theme, Hashi-child, and have added style rules to format h1 every way I know how, but the theme just ignores them. Its default formatting will not work for my pages, yet I cannot change it or get rid of it.

I have searched the forums for answers but this seems to be theme-specific and the answers others found helpful did not work in my case.

Here is the link to the sample page I am working with:
Sample Page

On that page you will see first the title that the theme inserts, followed by the title how I want it to look.

Here are pastebins for the page.php and style.css files:

page.php

style.css

I am familiar with HTML and CSS but know next to nothing about PHP, but am willing to tweak any file.

Thank you for whatever help you can give me.