I have just had this issue as well, I have 3 displays:

Internal Panel (Disabled)
27" on HDMI (Active)
27" on VGA (Active)

I managed to work around the problem by activating the internal panel so
it shows all 3 displays then I could drag the displays into the desired
layout.

Before applying the changes I turned the internal panel off again as I
didn't require it but it saved fine.

System Details:
DELL XPS 9560 running Ubuntu 17.10
External DELL Dock (TB16) with the displays attached

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https://bugs.launchpad.net/bugs/1724955

Title:
  unable to drag monitors in Display Arrangement

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