I have a 2017 MBP connected to a monitor with HDMI. On my laptop screen, when I double click the top bar of a window, it fills the whole screen up to the Dock. However, when I do that with a window that's in the monitor's screen, the window fills the screen vertically but not horizontally. Meaning I have to still manually resize the window.

Is this by design or am I doing something wrong?


Only double click show you all content. Press shift + double click fill all display :)

  • That maximizes the screen, which would be fine but I'd like to still "alt-tab". AFAIK maximizing a window fills the entire desktop and anything else will just switch desktops. And it still doesn't explain why double clicking top-panel works properly on the laptop screen. – Le Nguyen Duy Anh Nov 22 '17 at 14:55
  • Exactly, which is why I prefer most of my windows to just "fill the screen" (not sure if correct terminology) instead of full-screen. – Le Nguyen Duy Anh Nov 22 '17 at 15:00
  • so it happens that if you do not have enough space to fill the screen, try the behavior with a smaller window on your laptop screen – claudio Nov 22 '17 at 15:05
  • The monitor-space is empty when I drag a window into it. Double clicking the top pane does what I described - fills screen vertically, not horizontally. – Le Nguyen Duy Anh Nov 22 '17 at 15:07
  • you can change that behaivor in System Preferences > Dock – claudio Nov 22 '17 at 15:09

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