set $mode_system System: (l) lock, (e) logout, (s) suspend, (r) reboot, (S) shutdown, (R) UEFI
mode "$mode_system" {
    bindsym l exec $lock, mode "default"
    bindsym e exit
    bindsym s exec --no-startup-id systemctl suspend, mode "default"
    bindsym r exec --no-startup-id systemctl reboot, mode "default"
    bindsym Shift+s exec --no-startup-id systemctl poweroff -i, mode "default"
    bindsym Shift+r exec --no-startup-id systemctl reboot --firmware-setup, mode "default"

    # return to default mode
    bindsym Return mode "default"
    bindsym Escape mode "default"
}
bindsym $mod+Shift+e mode "$mode_system"