notifications top bar newest to oldest

Hi,
The listing is handled by BuddyPress using bp_notifications_toolbar_menu() which you can see here.
https://github.com/buddypress/BuddyPress/blob/master/src/bp-notifications/bp-notifications-adminbar.php#L21

I don’t see an sql filter for orderby clause here
https://github.com/buddypress/BuddyPress/blob/master/src/bp-notifications/classes/class-bp-notifications-notification.php#L677

So the only way will be to filter on “bp_notifications_get_all_notifications_for_user” which is available here
https://github.com/buddypress/BuddyPress/blob/master/src/bp-notifications/bp-notifications-functions.php#L165

So, you want to use that and filter if you need.
Hope that helps.

Thank you. I wasn’t able to get it to work with the following code in child theme’s functions.php. It still shows the original sort order it had. Not sure what I missed.

//sort notifications order in main nav
function bp_sortnotifications_toolbar_menu() {
	global $wp_admin_bar;
	if ( ! is_user_logged_in() ) {
		return false;
	}
	$notifications = bp_notifications_get_notifications_for_user( bp_loggedin_user_id(), 'object' );
	$count         = ! empty( $notifications ) ? count( $notifications ) : 0;
	$alert_class   = (int) $count > 0 ? 'pending-count alert' : 'count no-alert';
	$menu_title    = '<span id="ab-pending-notifications" class="' . $alert_class . '">' . number_format_i18n( $count ) . '</span>';
	$menu_link     = trailingslashit( bp_loggedin_user_domain() . bp_get_notifications_slug() );
	// Add the top-level Notifications button.
	$wp_admin_bar->add_menu( array(
		'parent'    => 'top-secondary',
		'id'        => 'bp-notifications',
		'title'     => $menu_title,
		'href'      => $menu_link,
	) );
	if ( ! empty( $notifications ) ) {
		foreach ( (array) $notifications as $notification ) {
			$wp_admin_bar->add_menu( array(
'user_id'           => 0,
		'item_id'           => 0,
		'secondary_item_id' => 0,
		'component_name'    => '',
		'component_action'  => '',
		'date_notified'     => bp_core_current_time(),
		'is_new'            => 1,
		'allow_duplicate'   => false,
	), 'notifications_add_notification' );;
	// Check for existing duplicate notifications.
	if ( ! $r['allow_duplicate'] ) {
		// Date_notified, allow_duplicate don't count toward
		// duplicate status.
		$existing = BP_Notifications_Notification::get( array(
			'user_id'           => $r['user_id'],
			'item_id'           => $r['item_id'],
			'secondary_item_id' => $r['secondary_item_id'],
			'component_name'    => $r['component_name'],
			'component_action'  => $r['component_action'],
			'is_new'            => $r['is_new'],
		) );
		if ( ! empty( $existing ) ) {
			return false;
		}
	}
	// Setup the new notification.
	$notification                    = new BP_Notifications_Notification;
	$notification->user_id           = $r['user_id'];
	$notification->item_id           = $r['item_id'];
	$notification->secondary_item_id = $r['secondary_item_id'];
	$notification->component_name    = $r['component_name'];
	$notification->component_action  = $r['component_action'];
	$notification->date_notified     = $r['date_notified'];
	$notification->is_new            = $r['is_new'];
	// Save the new notification.
	return $notification->save();
		}
	} else {
		$wp_admin_bar->add_menu( array(
			'parent' => 'bp-notifications',
			'id'     => 'no-notifications',
			'title'  => __( 'No new notifications', 'buddypress' ),
			'href'   => $menu_link,
		) );
	}
	return;
}
add_action( 'admin_bar_menu', 'bp_members_admin_bar_notifications_menu', 90 );