Stop users logging into Google using the wrong login system

[TwistedHelixis]

When you open Chrome there are currently two ways a user can add a second account. The correct way is to create a seperate Chrome profile using the little circle icon near the X (top right of window), but I find lots of staff use the 'other method', which is to click the circle further down and then attach the account, which doesnt create the account in a seperate profile.

 

Is there a way to stop users using the 'other method'?