Could you please share the screenshots from the admin area of your website where you have created the custom attributes?

Also, please make sure that you have configured the search form to search product categories as displayed in the attached screenshot.

I hope you are well today and thank you for your question.

You can resolve this by adding the below CSS code in the Custom CSS option of Ivory Search plugin settings on the path Ivory Search -> Settings -> Settings

@media screen and (max-width: 1200px){
.is-menu.is-dropdown form {
    min-width: 250px;
}
}

Best regards,
Ivory Search Support

I hope you are well today and thank you for your question.

The issue can not be fixed using CSS but have to change the plugin PHP code.

I will resolve it in the upcoming version of the plugin.

Best regards,
Ivory Search Support

Please also use the below CSS code to hide the images on the search results page.

.search-results article .post-thumb {
    display: none;
}

I have edited the URL that you have added in your initial reply.