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Tips on Customizing Old Post Notification

How to Hide the "Old Post Notification" Admin Menu

function plt_hide_old_post_notification_menus() {
	//Hide the "Settings → Old Post Notification" menu.
	remove_submenu_page('options-general.php', 'old-post-notification');
}

add_action('admin_menu', 'plt_hide_old_post_notification_menus', 11);

Where do I put this code?

How to Hide the "Old Post Notification" Meta Box

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

	//Hide the "Old Post Notification" meta box.
	remove_meta_box('old-post-notification', $screen->id, 'normal');
}

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

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