Homepage Slider option gone

Hi. I hope for a friendly soul to help me.

I am using the Klasik free wp theme. And my homepage post slider is acting weird.

I do not get the chance to set my featured image as a homepage slider. The field “Post options” is totally missing in the post admin area.

https://www.klasikthemes.com/codex/setup-homepage-slider-in-klasik-theme/

Also when browsing my page, the right side of the already placed homepage post image is cropped and missing the right side of it.

I really hope that you can help me soon as possible.

My page is https://www.e-nielsen.dk

/Helle