Display of posts looks cramped

Hi

Thanks for presenting the Annual Archive plugin. It looks great.

I am using X the theme, with the stack called: Icon

When I go from this page: https://newsite.jimiholstebro.dk/nyheder/arkiv/

and click on any of the links, the posts only show up as cramped headlines. I feel silly that I can’t figure out what is wrong, but I would like the post(s) to show as a headline, a featured image and maybe even a excerpt of the text in the posts.

Do any of you know how I might get there. I should say, that my skills in coding is quite unimpressive.

Thanks in advance

/DTJ

https://www.ads-software.com/plugins/anual-archive/