Opening notifications
Click the bell button next to Search in the left navigation sidebar. The bell shows an indicator while you have unread notifications.

Working through your notifications
Notifications are grouped into Today and Earlier so recent activity is at the top. Filter the list with All, Unread, or Dismissed to focus on what still needs attention or to find something you cleared earlier.
Opening a notification marks it as read and takes you to the related import or release note. Dismiss individual notifications you no longer need, or use Dismiss all to clear the list; a dismissed notification can be restored from the Dismissed filter.
Notification emails
Notifications are also sent to you by email. On the Preferences tab in Settings you can turn off Receive notification emails to stop all of them while keeping the in-app notifications, or keep emails on and choose which notification types you want them for.