How do I disable autoLogin?

Issues & Assistance KDE
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https://wiki.archlinux.org/title/SDDM#Autologin

Autologin

SDDM supports automatic login through its configuration file, for example:

/etc/sddm.conf.d/autologin.conf

[Autologin] 
User=john 
Session=plasma

This configuration causes a KDE Plasma session to be started for user john when the system is booted. Available session types can be found in /usr/share/xsessions/ for X and in /usr/share/wayland-sessions/ for Wayland.

See if you can find the config with these lines on your system and comment out the lines. Or, if it is a separate config in /etc/sdd.conf.d/ like in the example you can try moving it to backup.

sudo mv /etc/sddm.conf.d/autologin.conf /etc/sdd.conf.d/autologin.conf.bak

Alternatively, here is another suggestion from a different forum: SDDM autologin override - #4 by Tomek - KDE Plasma - Manjaro Linux Forum

Go to System settings → Startup and Shutdown → Login Screen (SDDM) and find on the bottom Behavior button and uncheck autologin.

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