This will make all selected content containers equaly spaced away from each other, Enter into the dialog box how much you want the spacing to be.

Aligns Left all selected containers to the topmost selected one

This will make all selected content containers equaly spaced horizontaly away from each other (starting with topmost container), Enter into the dialog box how much you want the spacing to be.

Aligns Top all selected containers to the topmost selected one

Selects All Containers

Aligns right all selected containers to the topmost selected one

Aligns Bottom all selected containers to the bottom most selected one