The alignment commands are available in the 2D Home ribbon's Arrange section. In the figure below, the oval at the center top is the primary selection, or the object that was selected last. Since all other selected objects align to the primary selection, the rectangle and the polyline will align to the oval's placement in the display. At the bottom of the figure, you can see the result of applying the Align Middle and Align Center commands; note that the rectangle and polyline are moved to the oval's position.