下面的函数应该对您有所帮助。它将从“外观”菜单项中删除默认菜单项，并在仪表板中删除一个新菜单项。

add_action( \'admin_menu\', \'fb_customize_admin_menu_hide\', 999 );
function fb_customize_admin_menu_hide(){
    global $submenu;

    // Remove Appearance - Customize Menu
    unset( $submenu[ \'themes.php\' ][ 6 ] );

    // Create URL.
    $customize_url = add_query_arg(
        \'return\',
        urlencode( wp_unslash( $_SERVER[\'REQUEST_URI\'] ) ),
        \'customize.php\'
    );
    // Add sub menu page to the Dashboard menu.
    add_dashboard_page(
        __( \'Customize\' ),
        __( \'Customize\' ),
        \'customize\',
        esc_url( $customize_url ),
        \'\'
    );
}