In your ProxySG's policy, you have the options to select the following WebEx operation controls:
Host Meeting
Join Meeting
Login
Share Application
Upload Files
However, when using 'WebFilter' for the Blue Coat content filter data source, you only be able to see the following web operation controls:
Host Meeting
Join Meeting
Login
You must update your WebFilter subscription to Intelligence Services in order to see or use all five of the WebEx operation controls mentioned above.
This is an expected behavior or by design.
Reach out to your sales point of contact, or customer service and ask to subscribe to Intelligence Services for your appliance.