How to Hide Autocomplete LearnDash Lessons and Topics Admin Menus

function plt_hide_autocomplete_learndash_menus() {
	//Hide "GrassBlade".
	remove_menu_page('grassblade-lrs-settings');
	//Hide "GrassBlade → GrassBlade".
	remove_submenu_page('grassblade-lrs-settings', 'grassblade-lrs-settings');
	//Hide "GrassBlade → Autocomplete LearnDash Lessons & Topics".
	remove_submenu_page('grassblade-lrs-settings', 'grassblade-autocomplete_learndash');
	//Hide "GrassBlade → Add-ons".
	remove_submenu_page('grassblade-lrs-settings', 'grassblade-addons');
}

add_action('admin_menu', 'plt_hide_autocomplete_learndash_menus', 13);

Where do I put this code?