This goes over switching the window manager of KDE to bspwm.
sudo apt install bspwm
Create three files with the following contents
mkdir -p ~/.config/bspwm
mkdir -p ~/.config/sxhkd
wget -O ~/.config/bspwm/bspwmrc https://raw.githubusercontent.com/ChrisTitusTech/BSPWM-on-KDE/main/bspwmrc
wget -O ~/.config/sxhkd/sxhkdrc https://raw.githubusercontent.com/ChrisTitusTech/BSPWM-on-KDE/main/sxhkdrc
chmod +x ~/.config/bspwm/bspwmrc
chmod +x ~/.config/sxhkd/sxhkdrc
sudo wget -O /usr/share/xsessions/plasma-bspwm.desktop https://raw.githubusercontent.com/ChrisTitusTech/BSPWM-on-KDE/main/plasma-bspwm.desktop
/usr/share/xsessions/plasma-bspwm.desktop
[Desktop Entry]
Type=XSession
Exec=env KDEWM=/usr/bin/bspwm /usr/bin/startplasma-x11
TryExec=/usr/bin/startplasma-x11
DesktopNames=KDE
Name=Plasma bspwm
bspwmrc and sxhkdrc are using both the stock example files @ /usr/share/doc/bspwm/examples