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:
Activate a grid object, then activate the viewport to align the grid with by right-clicking in the viewport.
Do either of the following:
Right-click to open the quad menu, then, in the Tools 1 quadrant, choose Align Grid to View.
Using the Default menu system, choose Tools menu > Grids And Snaps > 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.