Unregister navigations menus in Genesis. Source: https://my.studiopress.com/snippets/navigation-menus/

unregister-navigations-menus-genesis.php

<?php

//* Unregister both primary and secondary navigation menus in Genesis
remove_theme_support( 'genesis-menus' );

unregister-primary-navigation-menu-genesis.php

<?php

//* Unregister the primary navigation menu in Genesis
add_theme_support( 'genesis-menus', array( 'secondary' => __( 'Secondary Navigation Menu', 'genesis' ) ) );

unregister-secondary-navigation-menu-genesis.php

<?php

//* Unregister the secondary navigation menu in Genesis
add_theme_support( 'genesis-menus', array( 'primary' => __( 'Primary Navigation Menu', 'genesis' ) ) );