Hi,
1. You can change the overall theme here, that is the best way to change the layout too, as the themes have pre-defined styles for the given layout.
To get image for PDF results, check out this knowledge base.
2. The results page itself is not something the plugin can change, that is fully controlled by the theme you are using. I may have to check this out directly to see what exactly is wrong, but it is more likely a theme related issue. I am more than happy to help if I can though. Whatever is displayed on the results page is up to the theme, a plugin can’t change that unfortunately.
3. Because with elements=’search’ ratio=’30%’ only the search bar is printed and the ratio can’t have an effect on a single element, as there is nothing to compare to. I assume you want to change the search bar width, you can do that here, that is much cleaner and you can change it for other devices too.