from any page of CRS you will see the iconat the very top right of the page, the number of new notifications shall be displayed as number which next to the icon. you can click on the icon (1)to see the list of notifications (2) and click on each message (3) to go to request details or batch details.
CRS will only notify a user about new commentcomments/feedback/questionquestions/answer answers added if it provided in CRS. For comments which come from out side of CRS such as JIRA, user theuser will not get any notification. Please note this is in addition to email notifications. The system will also send an email notification for new comments, feedback, and Q&A.