@neauoire The MacDecorator is a window-bar styling add-on; you can code more decorators by writing them yourself, see MacDecorator's source here: https://github.com/haiku/haiku/tree/master/src/add-ons/decorators/MacDecorator
Right now this only affects window border styling. But the core work to do widget styling also is complete; you can write your own widget styling engine already, but we haven't made a way to change those in Preferences yet.
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