Plastik window decorations

[Peter Humphrey]

Morning all,

System Settings | Application Style | Window Decorations | Plastik ? It's 
gone. Searching for it via Get New Window Decorations and installing it brings 
it back, or something like it. But after logging out and in it's gone again.

Something is broken here. Can I install the window decorations I like, or not? 
And why has Plastik gone? What other set is available that does not waste 
great slabs of screen space the way Breeze and Oxygen do?

-- 
Regards,
Peter.

Gentoo testing system, openrc-0.42.1
gcc 9.3.0, sys-kernel/gentoo-sources 5.4.38
QT 5.15.0, KDE frameworks 5.70.0, KDE plasma 5.18.5
KDE apps 20.04.1 incl KMail 5.14.1 (20.04.0), akonadi 20.04.1
dev-db/mariadb-10.4.12, net-libs/webkit-gtk-2.28.2
x11-drivers/xf86-video-amdgpu 19.1.0
dev-libs/amdgpu-pro-opencl-19.30.838629