ThinPro - How to lockdown connection manager from end user

I have a Thin Client T520 ThinPro system, on which I have defined several connections for the end user to choose from in the Connection Manager.

When switching back from the Administrator mode to the User mode, the end user is still able to manipulate the content of the connection manager. 

eg, it can delete, edit and add connection.

I've tried to find a setting which disables these 3 item/functionss for the end user, such that it can only activate/run the connections,

but I wasn't unable to find it.

Is this possible to lock the connection manager from changes by the end user?

If so, how can this be achieved?

OS kernel 3.18.3-hp

OS Build ID: T6X52011

Thanks in advance for the support.