phase changes

I am using the setup shown in the snapshot below. The Phase adjust is not responding at all.  It appears as if the phase adjust was disabled, even though it is enabled on the GUI. Could you give me a guidance on this issue please?   icollins  responded in the past to similar question as '' ...if phase adjust is to be used in an integer channel, it is possible to turn on a test mode to allow this..'', does this apply for this issue? If that is the case,  what is the test mode and how can I apply it?

Many thanks,