Hello,
I talked with the theme developer, and he replied to me
That’s correct the GP Navigation Search is adding a hardcoded form.
The link: https://generatepress.com/forums/topic/replace-gp-search/#post-1272331
Provides the PHP Snippet you will use to replace the hardcoded form with that plugins shortcode.
Sir, I don’t want to go for the child theme option.
Please let me know what we have to do ahead to make it work for us.