Activate a grid object. > Views menu > Grids > Align Grid to View
This command aligns a grid object with the current view. The grid object is aligned so that it's coplanar with the view and oriented with the top of the grid
at the top of the view.
To align a grid object with a viewport:
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Activate a grid object.
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Click or right-click in a viewport.
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Choose Views menu > Grids > Align Grid to View.
The grid object rotates to align itself with the selected view. The grid object is now planar, or parallel, with the viewport.