jchristopher/searchwp-customizations.php

## searchwp-customizations.php
<?php

// Limit SearchWP results to Category that has 'foobar' slug.
$search = new \SWP_Query( [
    's'         => 'coffee', // Search string.
    'tax_query' => [ [
        'taxonomy' => 'category',
        'field'    => 'slug',
        'terms'    => 'foobar',
    ] ],
] );

// Print all results.
print_r( $search->posts );
	<?php

	// Limit SearchWP results to Category that has 'foobar' slug.
	$search = new \SWP_Query( [
	's' => 'coffee', // Search string.
	'tax_query' => [ [
	'taxonomy' => 'category',
	'field' => 'slug',
	'terms' => 'foobar',
	] ],
	] );

	// Print all results.
	print_r( $search->posts );