Once you’ve found a theme you like, drop them into ‘Windows\Resources\Themes’. Once installed, you can head over to DeviantArt or ThemePack and look for a theme that best suits you. It modifies certain files in Windows 10 that are responsible for modifying the user interface, but it does restore these back to normal if UltraUXThemePatcher is uninstalled. An application called UltraUXThemePatcher needs to be downloaded first in order for third-party themes to be installed. This is where third-party themes come in. However, as the store isn’t the greatest in displaying what a theme can look like across the whole PC, alongside its clunky user interface, it’s almost a needle in the haystack of finding one that you will like.
Navigate to Settings > Personalization > Themes and it will show alongside the existing themes, ready to give your PC a change in looks. Browse the section and if you want to install one, just click on a theme, press ‘Get’ and it will install.
Go to the themes section in the Microsoft Store.