How to Hide Dynamic OG Image Generator Admin Menus

function plt_hide_dynamic_og_image_generator_menus() {
	//Hide "OG Images".
	remove_menu_page('dynamic-og-image-generator');
	//Hide "OG Images → Dashboard".
	remove_submenu_page('dynamic-og-image-generator', 'dynamic-og-image-generator');
	//Hide "OG Images → Settings".
	remove_submenu_page('dynamic-og-image-generator', 'doig-settings');
	//Hide "OG Images → Upgrade".
	remove_submenu_page('dynamic-og-image-generator', 'dynamic-og-image-generator-pricing');
}

add_action('admin_menu', 'plt_hide_dynamic_og_image_generator_menus', 1000000000);

Where do I put this code?