I have confirmed this with Qlik support, at the moment "Unlike QlikView, there's no direct method of determining how many active sessions there are on a Qlik Sense Server".
In QlikView QMC we can see which users are opening which applications but we can't do that in Sense.
For example for some reason I need to restart the QS services, before that I want to make sure no users are logging in Sense hub but there is no way for me to know that. And we need to have that function in Sense QMC.
We need to have a page in Sense QMC to show which users are logging in Hub and which applications they are opening.