Glad this helped you, as it was driving me crazy :chuckle:

Have you tried setting the value to what I said made dark work, just as a simple test?

If you are looking for Windows Search Results to show a dark background and your Windows 10 2004-thru-21H2 is set for dark mode, then you may be interested in the following as I finally figured out...

mfessler, Hello Martin,
I have the same questions as you and haven't been able to find any answers. I thought maybe after yesterday's update my PCs would have the dark mode search results, but that...

You don't need a Microsoft account, but if the PC is offline, then it won't get the server update that provides the dark mode function.

Microsoft is rolling out dark mode for Windows 10 Search

It's a server-side update, so not everyone has it just yet as they are rolling it out. :-)

I don't have it on my main account yet, but...