Powerpoint 2007 - how to delete Default Design list

[diana]

im updating Powerpoint themes. As I save my theme I noticed
in the Design tab, in Themes group, Colors drop down list
The first lot of items displayed on the list is:
This Presentation
Default Design 1
Default Design 2
...all the way down to
Default Design 12

Does anyone know to remove or clear this list?
I did a search on my local pc but no search returns came back with these file names

see screen capture.

dd

[HansV]

The color scheme, together with the font settings and effect settings, is part of the theme used by the presentation. Themes are stored in a .thmx file, usually in the Document Themes subfolder of your user templates folder.
See Adding Color Schemes to a Theme by PowerPoint MVP Echo Swinford.