How to Hide WPGraphQL Admin Menus

function plt_hide_wp_graphql_menus() {
	//Hide "GraphQL".
	remove_menu_page('graphiql-ide');
	//Hide "GraphQL → GraphiQL IDE".
	remove_submenu_page('graphiql-ide', 'graphiql-ide');
	//Hide "GraphQL → Settings".
	remove_submenu_page('graphiql-ide', 'graphql-settings');
	//Hide "GraphQL → Extensions".
	remove_submenu_page('graphiql-ide', 'wpgraphql-extensions');
}

add_action('admin_menu', 'plt_hide_wp_graphql_menus', 101);

Where do I put this code?