This is quick guide howto switch desktop from GNOME 46 to KDE Plasma 6 and display manager GDM to SDDM. I use here GNOME and KDE as example, same method works from KDE to GNOME or GNOME to XFCE, etc.

Check video guide, howto switch desktop from GNOME 46 to KDE Plasma 6 on Fedora 40:

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Install KDE Plasma 6 on Fedora 40⌗

1. Change root user⌗ 

su -

## OR ##

sudo -i

2. Check Available Groups⌗ 

dnf grouplist

Last metadata expiration check: 0:55:19 ago on Sun 26 May 2024 07:09:35 PM EEST.
Available Environment Groups:
   Fedora Custom Operating System
   Minimal Install
   Fedora Server Edition
   Fedora Cloud Server
   KDE Plasma Workspaces
   Phosh Desktop
   LXDE Desktop
   LXQt Desktop
   Cinnamon Desktop
   MATE Desktop
   Sugar Desktop Environment
   Deepin Desktop
   Budgie Desktop
   Development and Creative Workstation
   Web Server
   Infrastructure Server
   Basic Desktop
   i3 desktop
   Sway Desktop
Installed Environment Groups:
   Fedora Workstation
   Xfce Desktop
Installed Groups:
   Administration Tools
   Desktop accessibility
   LibreOffice
Available Groups:
   3D Printing
   Audio Production
   Authoring and Publishing
   Budgie
   ...

3. Install Selected Group⌗

I use here KDE Plasma Workspace as example.

dnf groupinstallinstall "KDE Plasma Workspaces"

4. Switch GDM to SDDM⌗

GDM also works normally. For more information check guide howto switch display manager on fedora - GDM / SDDM / LXDM / LightDM / KDM / XDM

systemctl disable gdm.service

systemctl enable sddm.service

5. Reboot⌗ 

reboot

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Thats all!