Tips on Customizing AMP

How to Hide AMP Admin Menus

function plt_hide_amp_menus() {
	//Hide "AMP".
	remove_menu_page('amp-options');
	//Hide "AMP → Settings".
	remove_submenu_page('amp-options', 'amp-options');
	//Hide "AMP → Analytics".
	remove_submenu_page('amp-options', 'amp-options#analytics-options');
	//Hide "AMP → Support".
	remove_submenu_page('amp-options', 'amp-support');
	//Hide "AMP → Validated URLs".
	remove_submenu_page('amp-options', 'edit.php?post_type=amp_validated_url');
	//Hide "AMP → Error Index".
	remove_submenu_page('amp-options', 'edit-tags.php?taxonomy=amp_validation_error&post_type=amp_validated_url');
}

add_action('admin_menu', 'plt_hide_amp_menus', 100);

Where do I put this code?

How to Hide AMP Meta Boxes

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

	//Hide the "Status" meta box.
	remove_meta_box('amp_validation_status', $screen->id, 'side');
	//Hide the "Stylesheets" meta box.
	remove_meta_box('amp_stylesheets', $screen->id, 'normal');
}

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