Aligning Drawing Objects
To align drawing objects:
1. Select the objects to be aligned, holding the <Ctrl> key down.
2. Click the arrow at the extreme right of the Align button.
3. Select an alignment mode in the list proposed.
Alignment by selection rectangle
When you select elements using a rectangle traced with the mouse, the commands Top (Bottom, Right, Left) align the selection on the top edge of the highest element (or bottom, right, left).
Centering is on the vertical or horizontal median.

You must then select the reference element by clicking it while holding down the <Shift> key.
Alignment by successive clicks
When you successively select elements with <Shift> key held down, the last element selected serves as reference: the selection is aligned on the top (bottom, right, left) edge of the element.
Centering is with respect to the last element selected.
Alignment on the grid
Note that the size of objects created without a grid or using a finer grid is modified to become a multiple of grid spacing (the object is either slightly enlarged or reduced to minimize modifications).