I've changed the look of the desktop to my preference, except one that does not budge...

Clicking the search icon on the taskbar brings up the search window with black background, such as this one:

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ID:	180475

Typing in the name of the program/app, brings up the search results:

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Name:	mmc search.jpg 
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ID:	180476

The system has a personalized theme where the background is slideshow and accent color is picked from the background image. This works well for all of the windows, but search...

Is there a way for changing the background for the search window to white, like in the resulting search window?
TIA...