In WEBEX events, the feedback bar did not appear for attendees, do I need to activate it somewhere?
When you say 'Feedback' are you referring to Chat or Q&A?
Q&A - https://help.webex.com/en-us/ydtufk/Conduct-a-Question-and-Answer-Session-in-Cisco-Webex-Events
Chat - https://help.webex.com/en-us/WBX21522/How-Do-I-Send-a-Chat-Message
See Feedback Icon below it did not appear for my attendees