I know that we can have Multiple Concurrent SSL VPN Sessions with One Username but my question is how to disable this feature?
Unfortunately this is not possible at the moment. There should be an existing Feature Request for exactly this. Just ask your SE.
As a (ugly) workaround, you could implement a script which checks the logged in users regularly (every minute?) and automatically disconnects older sessions of users who are logged in multiple times.
Previous discussions + article on the topic :
As AXI_IIEN_Remo already pointed out there is an existing FR for this. Please reach out to your local SE and have him add extra weight to the request.
I would expect that it does not matter how many devices users have they could surf safely from all of them. If you are afraid that user/password will be stolen then use client side certificates.
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