This tool is accessible via Main Menu > Transform > Distribute Objects. It allows you to adjust the spacing between objects.
Distribution works with three or more objects selected in the Work Area or in the Object Inspector.
Three vertical controls distribute objects vertically so that the tops, centers, or bottoms of the objects are equally spaced within the selection.
Three horizontal controls distribute objects horizontally so that the left sides, centers, or right sides of the objects are equally spaced within the selection.
The remaining two controls distribute objects both vertically and horizontally so that there are equal spaces between them.
An instant preview of the resulting distribution appears in the Layout panel and also in the Work Area.
Three objects are selected in the Work Area.
Preview of the distribution.
Objects from the example above are equally spaced with respect to their centers.