How to Hide Slider by 10Web Admin Menus

function plt_hide_slider_wd_menus() {
	//Hide "Slider".
	remove_menu_page('sliders_wds');
	//Hide "Slider → Sliders".
	remove_submenu_page('sliders_wds', 'sliders_wds');
	//Hide "Slider → Options".
	remove_submenu_page('sliders_wds', 'goptions_wds');
	//Hide "Slider → Import".
	remove_submenu_page('sliders_wds', 'demo_sliders_wds');
	//Hide "Slider → Ask a question".
	remove_submenu_page('sliders_wds', 'https://wordpress.org/support/plugin/slider-wd/#new-post');
}

add_action('admin_menu', 'plt_hide_slider_wd_menus', 11);

Where do I put this code?