Below is a short guide on how to update your Theme.
- The first and best practice is to make a backup, download your current theme to your desktop via FTP. After that delete theme from WordPress.
- Go to your account, to your downloads page, and download the theme
- Upload the new version of the theme via your WordPress dashboard or via FTP and that’s it.
- Add widgets block to where you would like to have the search bar.
Detailed instruction: https://premiumcoding.com/how-to-update-wordpress-theme-without-losing-customization/