Thank you for the reply. However, I am not referring to changing Displays. I referring to the default Desplay which is displayed immediately after logging in.
I found the setting to change what I am referring to in the following location:
In the upper right hand corner, Options ==> Default Display
Select the preferred display from the drop down list.
As a side note, I am confirming this setting is linked to what I am referring to in question 2.
When you create a new custom navigation tree, there is a checkk box to make it the "Default Display" - edit the Navigation Tree item that is currently the default, and un-check the box - it should revert back to the Physical Display.
This should be a per-user setting.
This should really be under the "Options" for the user, similar to the "Views" - sounds like another PER.