Synchronizes the contents of the open view windows, so when you track or dolly in one window the other windows move along with it.
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Choose Window sync again to turn synchronization off.
This normally applies to the orthographic windows only (Top, Side, Back, etc). However, it will work in the Perspective window if Perspective is turned off in the Viewing Panel, and one of the preset orthographic views (horizontal or vertical arrows) is clicked in the Viewing Panel..
See Use the view panel.
