In order to remove the Session Q&A tab, you will need to manually disable the Q&A for all sessions with a speaker attached.
To disable the Q&A for each session, please access:
1. Content > Agenda Center > Session Q&A Manager
2. Under Configure Session Q&A, type in the name of the session and select it > click Disable Session Q&A.
After the Q&A has been disabled for all sessions that has a speaker attached, the Session Q&A tab will automatically disappear.