Notifications on iOS
When a session or break has finished Focus will send you a system notification to inform you about it and to give you the opportunity to start the next session / break or extend the current one. If you have an Apple Watch paired and want to receive your Focus notification on your watch, please have a look here.
To receive those notifications, please make sure that Focus is allowed to send you system notifications. You can check this in the Settings.app / Notifications / Focus
Focus notifications are interactive when you have set the alert style to Banners or Alerts.
When you receive a banner notification on top of your screen, you can swipe down on the banner to see more options:
When you receive a notification on your lock screen or you want to interact with one in the Notification Center, you can simply swipe from right to left to see more options: