Tips on Customizing Post to Google My Business (Google Business Profile)

How to Hide Post to Google My Business Admin Menus

function plt_hide_post_to_google_my_business_menus() {
	//Hide "Post to GMB 1".
	remove_menu_page('post_to_google_my_business');
	//Hide "Post to GMB 1 → Dashboard 1".
	remove_submenu_page('post_to_google_my_business', 'post_to_google_my_business');
	//Hide "Post to GMB 1 → Settings".
	remove_submenu_page('post_to_google_my_business', 'pgmb_settings');
	//Hide "Post to GMB 1 → Auto-post templates".
	remove_submenu_page('post_to_google_my_business', 'pgmb_template_upsell');
	//Hide "Post to GMB 1 → Post Campaigns".
	remove_submenu_page('post_to_google_my_business', 'pgmb_postcampaign_upsell');
	//Hide "Post to GMB 1 → Affiliation".
	remove_submenu_page('post_to_google_my_business', 'post_to_google_my_business-affiliation');
	//Hide "Post to GMB 1 → Contact Us".
	remove_submenu_page('post_to_google_my_business', 'post_to_google_my_business-contact');
	//Hide "Post to GMB 1 → Support Forum".
	remove_submenu_page('post_to_google_my_business', 'post_to_google_my_business-wp-support-forum');
	//Hide "Post to GMB 1 → Upgrade".
	remove_submenu_page('post_to_google_my_business', 'post_to_google_my_business-pricing');
}

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

Where do I put this code?

How to Hide the "Post to Google My Business" Meta Box

function plt_hide_post_to_google_my_business_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Post to Google My Business" meta box.
	remove_meta_box('pgmb_post_creation_metabox', $screen->id, 'advanced');
}

add_action('add_meta_boxes', 'plt_hide_post_to_google_my_business_metaboxes', 20);