Metro skin for Steam. Reborn.
This skin for the new UI framework was created after Valve made it problematic to revert to the old-style windows and subsequently removed support for user-made themes.
My quest was to make the windows look as close as possible to those of the original Metro skin.
Metro by Rose
.Refer to the instructions provided by the patcher developer on its repository pages to access its themes, which include Metro by Rose.
Installing manually is also an option: