HDP 2.3 Ambari, Cannot update YARN memory configs

Hi All

I have downloaded and installed the Hortonworks HDP 2.3 Sandbox on a VMWare virtual machine. I have upped the RAM to 16GB and the number of cores to 8 on the virtual machine. When I try to use Ambari to update the configuration of the Sandbox to use more memory for the Node and Container using the “Set Recommended” button they Save Button remains disabled and despite Ambari warning me that my changes have not been saved and giving me the option to save none of the changes reflect.

I tried this in Chrome and Internet Explorer 11 with the same results.

What am I doing wrong here?

Thank you

Derck