Set a custom post type to not show up on the front end

functions.php

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<?php
add_action( 'template_redirect', 'wearewp_template_redirect', 1);
function wearewp_template_redirect() {
    global $wp_query;

    // redirect CPT_NAME_HERE CPT to home page
    if ( is_archive('CPT_NAME_HERE') || is_singular('CPT_NAME_HERE') ) {
        $url   = get_bloginfo('url');

        wp_redirect( esc_url_raw( $url ), 301 );
        exit();
	}
}