I tried to find this only to find this thread which is locked and does not give the answer:
How to restore default settings/ default themes

But I wanted to post this to help anyone that needs to completely reset WindowBlinds. This will completly purge WindowBlinds and reset it back to it's original stetting:

I figured it out myself by using the Windows search next to the Start Menu and searching for WindowBlinds.

What you have to do is uninstall WindowBlinds (using uninstall in your Windows settings), but then you have to delete the folder "WindowBlinds" in "C:\Users\Public\Documents\Stardock\"

When I tried this I actually deleted the "Stardock" folder in "C:\Users\Public\Documents\" because I didn't have any other Stardock programs.

Finally reinstall WindowBlinds. After I did this all my styles were reset back to the original settings. Yeah!

Also right after you reinstall WindowBlinds you might want to backup your "WindowBlinds" folder that is in "C:\Users\Public\Documents\Stardock\"

What I did was I went into "C:\Users\Public\Documents\Stardock\" then made a copy of "WindowBlinds" right inside there. It named it "WindowBlinds - Copy" and I renamed it to "WindowBlinds - Backup Copy".

Hope this helps.

Jacob P.