Hey again Erik,
I wasn’t able to open the link that you provided but I understand what you’re looking to do, thank you for the clarification.
To be able to display full posts on your post page you’ll have to make modifications in content.php which is located in the root folder of the theme. I strongly suggest not editing theme core files but rather making a copy in your child theme and making the changes there.
Once you have that open your child theme content.php and go to line 62, it looks like this:
<?php the_excerpt(); ?>
Replace that line with this one:
<?php the_content(); ?>
This should display full posts on your post page. Since read more is pretty much not having a use there you might want to use the CSS code I provided above as well in order to hide it.
Hope this helps ??
Best regards,
Bojan