Problem with Featured Image of Posts

Hi,

I have built a website with Hello Elementor Theme. There is a problem with the posts. There is no image selection option for featured image in post editor. (https://www.awesomescreenshot.com/image/39731399?key=b19aa1a4532fa92bc138b1b1061f6873 )

Is there anyone who can help me with this issue.

Thanks

The page I need help with: [log in to see the link]