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How to Hide Lightbox - Gallery Lightbox Admin Menus

function plt_hide_lightbox_popup_menus() {
	//Hide "Lightbox".
	remove_menu_page('wpdevart_lightbox');
	//Hide "Lightbox → Lightbox".
	remove_submenu_page('wpdevart_lightbox', 'wpdevart_lightbox');
	//Hide "Lightbox → Featured Plugins".
	remove_submenu_page('wpdevart_lightbox', 'wpdevart-lightbox-featured-plugins');
	//Hide "Lightbox → Hire an Expert".
	remove_submenu_page('wpdevart_lightbox', 'wpdevart-lightbox-hire-expert');
	//Hide "Lightbox → Support or Any Ideas?".
	remove_submenu_page('wpdevart_lightbox', 'https://wordpress.org/support/plugin/lightbox-popup');
}

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

Where do I put this code?

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