After creating your Session Feedback and enabling Ask a Question, you may notice that these survey types do not actually display in the Polls & Surveys section of the app. This behaviour is intentional, and aimed at making the user experience as smooth as possible.
Live Polls and Event Surveys are set to display within the Polls & Surveys section of the app as they are typically reserved for specific sessions (live polls) or purposes (event surveys). Session Feedback and Ask a Question on the other hand are set to display in the details area of the sessions that they are tied to. This is due to the fact that both of these survey options can be applied to all sessions, which could result in overcrowding the Polls & Survey section. It also helps the user in distinguishing what survey type they are selecting when multiple survey types have been applied to a session.