Thanks for reaching out on the Lucidchart Community!
Under the Selection Tools tab on the right-hand side, you can adjust the layout, as well as the vertical and horizontal spacing.
The red box indicates the style that it sounds like is currently selected. If you select the highlighted (in blue) option, it should put them directly below. From there you can adjust the vertical and horizontal spacing as desired. Hope this helps!
For anyone looking for basic instructions on how to create and edit Org Charts, please check out Org Charts.