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I got a fine and dandy mini DisplayPort to VGA adapter for my MacBook Pro - I hooked up an external Dell monitor and it works well in landscape.

Any tips on how to make the display on external monitor in portrait mode?

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The option should be visible by default for an external monitor, but I assume since you're asking this question that it is not.

There's a little-known trick that works for the internal LCD on MacBooks; I suggest trying that:

  1. Open System Preferences.
  2. Hold down the Command+Option keys, and click on the "Display" icon.
  3. On the right side of the Display preferences, find the drop-down box labeled "Rotation".
  4. Select the rotation you want.
  5. Close System Preferences. Rotation drop-down box in Display preferences
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    This will rotate both screens. I want to rotate only the external display. May 6, 2014 at 16:52
  • Hmm ... I was able to get this working with two external displays (with laptop in clamshell mode) and have one out of the two in portrait mode. May 21, 2020 at 22:15
  • Yeah, it works for me on a per-display basis. There should be a different dialog box (and therefore a different "Rotation" drop-down control) for each monitor. May 22, 2020 at 4:48

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