hostnamectl; # tested on
Operating System: Debian GNU/Linux 12 (bookworm)  
          Kernel: Linux 6.1.0-20-amd64
    Architecture: x86-64

# become root
su - root
apt update
# if it's graphical application
# and the user "user" is the user that started the x11 desktop
export DISPLAY=':0.0';
# cp -v /home/user/.Xauthority /root/.Xauthority
su user -c "/usr/bin/pluma" &

# test with xeyes
apt install x11-apps
su user -c "xeyes" &

# this should appear

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