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   Align Windows in macOS 10.12 Sierra

   Josh Centers

   Apple has made much of macOS 10.12 Sierra's notable features, like
   Siri, Picture in Picture, and the capability to unlock your Mac with
   your Apple Watch. But our favorite new feature ' automatic window
   alignment ' wasn't advertised by Apple at all, and it's so subtle you
   may not even realize you've used it.

   You move windows in Sierra just as you have since 1984, by clicking and
   dragging a window's title bar (or status bar). In Sierra, however, if
   you slow down briefly when the edge of the window you're dragging meets
   the edge of another window, the first window stops moving and aligns
   perfectly with the second window unless you force it past the edge. It
   doesn't matter which sides you're aligning.

   This trick is particularly handy in the Finder, where you often want
   multiple windows open. But it should work with windows from any app,
   and even windows from different apps. That lets you simulate the
   side-by-side look of Split View without messing with full-screen mode.

   Sierra's window alignment also kicks in when you're resizing windows,
   which, remember, you can do from any side of a window. Slowly drag the
   edge of one window to the edge of another to lock it in place. Or, if
   you're expanding one window that's next to another, window alignment
   makes it easy to match their heights.

   The windows on my Mac have never been so neatly arranged!

   [1][tn_Sierra-aligned-windows.jpg]

   If you want to precisely position your windows without aligning them,
   press and hold Option as you drag the window to bypass window
   alignment.

References

   1. http://tidbits.com/resources/2016-09/Sierra-aligned-windows.png

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