You can hide it in different ways. It depends on what is given.

• If your theme has an option or setting to hide , you can simply turn it off. I see that you are using a premium theme, so its better if you check that this setting exist.
• Or create a child theme out of the parent theme and then use the child theme to customize and remove the more link markup. You can do this by overriding the parent template that outputs it: https://codex.wordpress.org/Child_Themes
• Lastly if you don’t want to create child theme. Easiest is to hide via custom CSS in customizer:

  .main-content .more-link {
   display: none;
  }

Reference: https://en.support.wordpress.com/custom-design/editing-css/
Feel free to tweak the CSS selector to target correct element.

Your custom CSS needs to override the theme style.css. You can try again the custom CSS below and add !important designation to the style:

.main-content .more-link {
 display: none !important;
}

I added important to the CSS to mean that it will rule over the style.css. But still the best way of doing this is inside a custom style.css inside your child theme. I recommend you should learn doing that and its pretty helpful to you in the long term.

If that still doesn’t work, I could no longer think of other solutions. Maybe other volunteers here will assist. Thanks.