The default blur effect isn't that great, but someone did something about it. It's called kwin-effects-better-blur-dx!
Homepage: https://github.com/xarblu/kwin-effects-better-blur-dx
This guide will show you how to compile it for Solus - Plasma Edition.
INSTALLATION of TOOLS AND LIBS
First thing is to grab all the required libs and tools to compile kwin-effects-better-blur-dx.
sudo eopkg it -c system.devel
sudo eopkg install libepoxy-devel kdecoration-devel kf6-kcmutils-devel kf6-kwindowsystem-devel kwindowsystem-devel kcmutils-devel kcmutils-devel kf6-kconfigwidgets-devel kf6-kcolorscheme-devel kf6-krunner-devel plasma5support-devel qt6-wayland-devel kwin-devel git
DOWNLOAD & COMPILE
Next is to download and compile kwin-effects-better-blur-dx.
cd Downloads
git clone https://github.com/xarblu/kwin-effects-better-blur-dx
cd kwin-effects-better-blur-dx
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=/usr
make -j$(nproc)
INSTALLATION
Simple type;
sudo make install
ENJOY!!!
