function plt_hide_astro_sticky_buttons_menus() {
//Hide the "AstroThemes" menu.
remove_menu_page('astro-plugin-panel');
//Hide the "AstroThemes → Sticky buttons" menu.
remove_submenu_page('astro-plugin-panel', 'astro-sticky-buttons');
}
add_action('admin_menu', 'plt_hide_astro_sticky_buttons_menus', 11);