Using Fedora 35 here, still using i3. The trick is to modify /usr/lib/systemd/user/plasma-kwin_x11.service, here's mine. [Unit] Description=KDE Window

Using Fedora 35 here, still using i3. The trick is to modify /usr/lib/systemd/user/plasma-kwin_x11.service, here's mine. [Unit] Description=KDE Window Manager #Wants=plasma-kcminit.service PartOf=graphical-session.target [Service] ExecStart=/usr/bin/i3 BusName=org.kde.KWin Slice=app.slice Restart=on-failure The only downside is that you will need to wait a bit more for it to start.