Is there a way in the UDM Wizard to see what factors you have selected as part of the UDM and/or remove a factor you have in there but changed your mind about?
The UDM Wizard and Data Window are designed to be used in concert with each other...
To see the full UDM Definition:
Run a UDM through the Data Window.
The Data Window displays the full UDM Definition as part of the returned results set.
To edit a UDM Definition:
Bring up the UDM in the UDM Wizard's Modify Screen - select whatever factor you want to work with - change the definitions for that factor - and hit the Save button.
To check your work:
Simply rerun the UDM through the Data Window. When query execution is complete verify any changes that you made to the UDM Definition by looking at the returned results set.