I was able to customize my search form in my old theme to echo to my created search page - Google CSE. For whatever reason, anything I do to the searchform.php file has no effect on the search itself.
I added a search modal on the header and it always points to /?s even though I have added action="<?php echo esc_url( '/_search' ); ?>"> along with some other code via the searchform.php on my child theme.
Is there a different location for the search form? I assume the search modal along with any search button is customizable through the same file in the theme?