Hello @sfeher,
If you want to customize the search bar then you can edit the file search.php filw which is inside the theme file education-hub-pro.
Also, we would like to notify you that you should not make any changes directly in your original theme file.
To make any changes in the original theme file, you should always go through the child theme or else upon update to the latest version all of your modification will be lost.
Thank you.