After upgrading to the latest Cloud application version - 9.0.205 - I no longer have the ability to drop individuals when in a group call. The only option I have is to "end call". This is the same if I initiate the call or if someone calls my personal account. Works the same for a VMR as well.
I shared this with Lifesize Support and they confirmed that the latest upgrade no longer allows dropping individual participants on the Cloud application but does allow that from the Icon codec.