How to fix Liebling theme featured image?

I used the Liebling theme, and on the post, the page featured images that did not look good on mobile and desktop. I want to change the featured image like Casper theme post. I tested some code injections, and the scripts didn’t work.

Hi @tedknow
Can you share some screenshots of the post/page that did not look good?

here is desktop version and mobile version SS. I don’t like that full width cropped look.

Screenshot 2022-08-12 184148

how to change it cover look like Casper?