The generate_svg_icon_element filter allows change the default icons used throughout the theme.
The available options are:
menu-bars
close
search
categories
tags
comments
arrow
arrow-right
arrow-left
arrow-up
For example, if you want to use a custom navigation search icon to replace the default one, then this function can be used:
add_filter( 'generate_svg_icon_element', function( $output, $icon ) {
if ( 'search' === $icon ) {
$output = 'Your-custom-search-icon';
}
return $output;
}, 10, 2 );
Make sure to only replace your-svg-here with the actual SVG code in the snippet above.