Search draft, private, and scheduled posts in admin side only

searchwp-customisations.php

<?php

// Search draft, private, and scheduled posts in admin side only
add_filter( 'searchwp\post_stati', function ( $post_stati, $args ) {
    $is_search = is_search() || isset( $_REQUEST['s'] );
    $is_swp_search = isset( $_REQUEST['swps'] );
    $is_admin  = is_admin() && ! wp_doing_ajax();

    // Do not modify post statuses on SearchWP results pages and normal frontend searches
    if ( ($is_swp_search || $is_search) && ! $is_admin ) {
        return $post_stati;
    }

    // Include draft, private, and scheduled (future) posts in admin search
    return array_unique(
        array_merge( $post_stati, [ 'draft', 'private', 'future' ] )
    );
}, 20, 2 );