Hello,
All we have got for the search are a few options that you can check in the below screenshots.
https://gyazo.com/d062acb1716332daf2285b8e679c1e46
https://gyazo.com/43e1cda0f4df7a7828f3b7ae33d9ddd7
Unfortunately, such customization as you want for the search is not included in our support.
You can get acquainted with Envato Support Policy here:
https://themeforest.net/page/item_support_policy
As for the customization of the “Search” page, there’s currently no way to do that, unfortunately. We appreciate you taking the time to let us know what you’re looking for.
Kind Regards