I have an external monitor connected to a Macbook. The current behaviour of the dock is that it jumps from one display to another whenever the cursor is at the bottom, which I find quite annoying.

Is is possible to change this to either of the following?

  • Show the dock permanently on the primary display only
  • Show the dock permanently on both displays

You can achieve the first, lock it to a single display - though it will entail a change in working practice.

System Prefs > Mission Control
Uncheck "Displays have separate Spaces"

Your Spaces/Desktops will then always move as a pair, locked together.

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Then use System prefs > Displays > Arrangement
You can drag the menu bar representation to define your primary display. The Dock will remain always on this display.

enter image description here

As the Dock is always shown either on the active Space/Desktop in single-screen, or only on the primary display of a multi-screen setup, there's no way to make it appear on two displays simultaneously.

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    The problem with setting ""Displays have separate Spaces" is that it means I'll only have a menu bar on the primary display. For me, this is even more annoying than the dock jumping around. – Dónal Sep 11 '19 at 14:48
  • You didn't mention that in your question. Personally I hate 'displays have separate spaces' & have done since it was introduced. I've had dual monitors on Macs for about 20 years without ever needing that ;) – Tetsujin Sep 11 '19 at 14:51
  • Presumably you've just learned to live with the Dock jumping around, or it never bothered you? – Dónal Sep 11 '19 at 15:02
  • It doesn't go anywhere. It stays on my primary screen, right where I want it to be. It's separate spaces with mis-matched screen pairs, 2 menu bars & 2 docks that drive me bananas. I want one, right where I put it… muscle memory wins every time. I imagine if you use a track pad, it would be a long reach, but I never use a trackpad either. I'd call them 'the devil's work' but I don't think that adequately describes how bad I think they are ;) – Tetsujin Sep 11 '19 at 15:06

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