[drdaeman]

Not for many laptops as GTK doesn't handle non-integer scaling well, so it doesn't really support MidPPI-screens. It can work normally and work for HiPPI with x2 scaling, and that's it.

I'm unaware of any simple way to set larger widgets - I think GNOME had some knobs but in their quest to "simplify" UIs they were removed long time ago.

There are no theme-based workarounds in Mint (i.e. theme with larger widgets), either. Their theming team suggest if one's got a 13" FullHD screen they've just got to have small widgets (https://github.com/linuxmint/mint-themes/issues/90)

Qt has somewhat better support for such displays, but I think the last Mint KDE release is 17.2.