This is quick guide howto switch desktop from GNOME 49/48/47 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 49/48 to KDE Plasma 6 on Fedora 43/42:

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Install KDE Plasma 6 on Fedora 43/42/41

1. Change root user

su -

## OR ##

sudo -i

2. Check Available Groups

dnf group list

Updating and loading repositories:
Repositories loaded.
ID                          Name                                        Installed
neuron-modelling-simulators Neuron Modelling Simulators                        no
kde-education               KDE Educational applications                       no
kde-media                   KDE Multimedia support                             no
kde-mobile                  KDE Mobile                                         no
kde-mobile-apps             KDE Mobile Apps                                    no
kde-office                  KDE Office                                         no
kde-pim                     KDE PIM                                            no
kde-software-development    KDE Software Development                           no
libreoffice                 LibreOffice                                       yes
kf6-software-development    KDE Frameworks 6 Software Development              no
mate-applications           MATE Applications                                  no
milkymist                   Milkymist                                          no
network-server              Network Servers                                    no
kde-apps                    KDE Applications                                   no
office                      Office/Productivity                                no
python-classroom            Python Classroom                                   no
python-science              Python Science                                     no
robotics-suite              Robotics                                           no
rpm-development-tools       RPM Development Tools                              no
security-lab                Security Lab                                       no
sound-and-video             Sound and Video                                    no
swaywm-extended             Sway Window Manager (supplemental packages)        no
system-tools                System Tools                                       no
text-internet               Text-based Internet                                no
vlc                         VideoLAN Client                                    no
window-managers             Window Managers                                    no
d-development               D Development Tools and Libraries                  no
admin-tools                 Administration Tools                               no
audio                       Audio Production                                   no
authoring-and-publishing    Authoring and Publishing                           no
budgie-desktop              Budgie                                             no
budgie-desktop-apps         Budgie Desktop Applications                        no
c-development               C Development Tools and Libraries                  no
cloud-infrastructure        Cloud Infrastructure                               no
cloud-management            Cloud Management Tools                             no
container-management        Container Management                              yes
compiz                      Compiz                                             no
cosmic-desktop              COSMIC Desktop                                     no
cosmic-desktop-apps         COSMIC Desktop Supplementary Applications          no
3d-printing                 3D Printing                                        no
desktop-accessibility       Desktop accessibility                             yes
design-suite                Design Suite                                       no
development-tools           Development Tools                                  no
domain-client               Domain Membership                                  no
editors                     Editors                                            no
education                   Educational Software                               no
electronic-lab              Electronic Lab                                     no
engineering-and-scientific  Engineering and Scientific                         no
freeipa-server              FreeIPA Server                                     no
games                       Games and Entertainment                            no
headless-management         Headless Management                                no
kde-desktop                 KDE                                               yes

3. Install Selected Group

I use here KDE Plasma Workspace as example.

dnf group install kde-desktop

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!