I hope you are well today and thank you for your question.
Currently, the Ivory Search plugin does not provide this functionality to non-AJAX search forms but I will consider implementing it in the future version of the plugin.
In the meantime, you can achieve this by developing a custom code.
If you are not a developer, you can consider hiring a developer to develop it. You can hire a developer from any freelance site or WordPress agency.
You can also consider hiring me to develop it for you using the form https://ivorysearch.com/custom-work/
Best regards,
Ivory Search Support