An example of a custom function used to assign a custom layout to Freelancer using a conditional and the freelancer_layout filter hook.

freelancer-custom-layout-function.php

add_action( 'wp_head', 'my_custom_layout' );
/*
 * This would assign a No Sidebar layout to all "Pages"
 * on your site, but have no effect on any other area.
 */
function my_custom_layout() {
    
    // If NOT a "Page" then do nothing.
    if ( ! is_page() )
        return;
        
    // Filter in the No Sidebar layout callback function.
    add_filter( 'freelancer_layout', 'freelancer_return_no_sidebar' );
    
}