Using Kubuntu 16.04, I haven't found a way to get to the "Display and Monitor" settings without first going to "System Settings" and then click the display and monitor icon. This annoys be, because I would rather like to have an icon or tray setting (like the old krandrtray) to easily switch monitor configurations.
Is there a way to get to the "Display and Monitor" dialog directly -- via the command line, or some widget?
I think the what you are looking for is the command
kcmshell5 kcm_kscreen
On a sidenote, to find out which modules you can start with kcmshell5, use
kcmshell5 --list
Personally, I think the easiest way is, to activate krunner (Alt+Space or Alt+F2), enter Display and what you are looking for should be one of the suggestions (the first one on my system).