Align Objects > Centered, Frame Both (Modify Menu)

This command can be used to center all kinds of objects both horizontally and vertically with respect to a specified rectangular frame. They are moved horizontally so that they are the same distance from the left and right of the frame and vertically so that they are the same distance from the top and bottom of the frame. All chosen objects are treated as a single unit, that is they are all moved by the same amount.

The objects to be centered must be chosen. Click on objects to choose them.

The first corner point of the frame can be entered by clicking the mouse anywhere in the drawing.

The second corner point of the frame can be entered by clicking the mouse anywhere in the drawing.

The orientation is determined by the overall bounding box of all objects, not by their actual contours.