What are you actually looking to achieve by disabling session sharing? Is the goal to have multiple connections to the same server that are connected independently?

I'm not so sure this is possible. I have seen a registry settings for a 3rd party TS enhancement product but not for native TS or RDS. There are regsitry settings for allowing or denying multiple sessions per user but that won't have an impact on session sharing.

Would this setting help?

I am trying to get more than one session for one user.

Thanks, that is helpful.

Yes, although this is per managed application so if you published hundreds of applications it would take a little while to configure. The other thing would be that if you wanted some users to use session sharing then I would guess you'd need to publish the application twice?, once with session sharing enabled and once with it disabled.