How do I switch between multiple users in KitKat via Lockscreen?
Multiple user support was designed for tablets only in 4.4 KitKat, and therefore the user picker only appears in landscape mode.  On CM11 for phones you will need to enable lockscreen rotation by adding a line lockscreen.rot_override=true to your build.prop file in the same manner as you did to enable multiple users:

echo "lockscreen.rot_override=true" &gt;&gt; build.prop


Reboot, rotate the phone to landscape mode, and you should see the user picker on the lockscreen.