File 00-general.conf of Package sddm.openSUSE_Backports_SLE-15-SP1_Update

[XDisplay]
ServerPath=/usr/bin/X
SessionCommand=/etc/X11/xdm/Xsession
DisplayCommand=/etc/X11/xdm/Xsetup
MinimumVT=7
# boo#1089932
EnableHiDPI=true

[Users]
# boo#979775
ReuseSession=true