High dpi screen

Hi
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?
Thanks
Tim

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