Search pre-view layout broken

Sorry, but I can’t really tell from the frontend alone. Solving this would require a deeper look at how the ajax search is built. It may well require some changes to make it use Relevanssi properly, but there are so many ways a search like this can be built that I can’t really tell.

Here’s a very thorough article on the topic: https://joebuckle.me/get-relevant-search-results-in-wordpress-using-relevanssi-and-ajax/

No; this issue is related to your theme, and fixing that does not fall under the Relevanssi support. It would take me hours to figure out how your theme works in the first place. A developer familiar with the theme you’re using would be the best option.