Different Navigator Layouts between same version of the Web Client

I write GUI automation tests against our plugin in the WebClient.

I recently noticed the following difference ..

I have two different Servers running vCenter Version 6.0.0 b

When i access 1 server the docking is different and there is a "Navigator" heading, the other does not have this?

The Work In Process and Tasks/Alarms is also displayed differently

Is this customizable? Not sure how this is happening but it effects our automation in some cases as some of the underlying container classes are different depending on what GUI your looking at.

Thanks

Tim