How to Hide WpDevArt Organization Chart Admin Menus

function plt_hide_organization_chart_menus() {
	//Hide "Wpdevart Chart".
	remove_menu_page('wpda_chart_tree_page');
	//Hide "Wpdevart Chart → Charts".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_tree_page');
	//Hide "Wpdevart Chart → Themes".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_tree_themes');
	//Hide "Wpdevart Chart → Popup Themes".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_tree_popup_themes');
	//Hide "Wpdevart Chart → User Permissions".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_tree_user_permissions');
	//Hide "Wpdevart Chart → Featured Plugins".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_featured_plugins');
	//Hide "Wpdevart Chart → Featured Themes".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_featured_themes');
	//Hide "Wpdevart Chart → Hire an Expert".
	remove_submenu_page('wpda_chart_tree_page', 'wpda_chart_hire_expert');
	//Hide "Wpdevart Chart → Support or Any Ideas?".
	remove_submenu_page('wpda_chart_tree_page', 'https://wordpress.org/support/plugin/organization-chart/');
}

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

Where do I put this code?