Hello,
Sorry to hear you are having issues. Need more information.
- Windows version numbers. Please use Winver.exe for full Windows version numbers.
- Start10 version.
I believe, that blue folder background mark for new folders(recently added program) and its follow your accent color. You can change that color if you change your accent color to something darker.

Tray it and report back.
Thanks
Basj,
Stardock Community Assistant.