Normal user 'dietpi' not listed for autostart (X dwm)

Troubleshooting
1

Hi, I manually installed the dwm x-window-manager, and registered it with

update-alternatives --install /usr/bin/x-window-manager x-window-manager /usr/local/bin/dwm 100

autostart into dwm works, but I am root!

o.k., I fired up dietpi-config AutoStart → Desktop Automatic login
However, there is only one choice: root UID:0

How can I login as automatically as a normal user ‘dietpi’?

BTW: ‘Manual’ login as dietpi, and starting dwm with startx works.

2

would it be an option to select 17 : Custom script (foreground, with autologin)? Usually there you should be able to select user dietpi