Could you please temporarily use the “Default WordPress Search Engine” instead of “Inverted Index Search Engine” in the Options of the search form to see whether it works fine?

Could you please share some screenshots of your configuration so I can troubleshoot it?

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

@media (max-width: 443px) {
    body .is-menu form.is-search-form {
        right: 0;
        left: 0;
        position: fixed;
        z-index: 999999;
        top: 62px;
        max-width: 100%;
    }
}

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

Currently, the Ivory Search plugin does not provide this functionality but I will consider implementing it in the future version of the plugin.

Best regards,
Ivory Search Support

I hope you are well today. Thank you for posting here.

This is because you have not created any index yet.

Please press the “Delete Index” button and then press the “Crete Index” button.

Best regards,
Ivory Search Support