Is it possible to define a thumbnail?

I use the free version of Meta Slider and am absolutely satisfied and nothing stands in the way of a purchase.

My question: If I have defined a slide that works, and I share it on Facebook, it doesn’t show one of the images but the standard image of the website. (https://mecker-ecke.com)

Can you define a default image, or is that only possible in the PRO version?

Facebook should at least show one image (SEO)

Regards, Klaus Wilde

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