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[kde-linux] High dpi screen

I've recently acquired a notebook with 3200 x 1800 screen
After reading various posts I thought KDE would be able to do the right thing. However, I've set the dpi in system settings | Fonts | Force fonts dpi - which works fine for fonts but things like the scroll bar, close buttons and those sorts of icons remain almost invisibly tiny.
Is there some way to change everything?
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