When you have more than one object selected in the Layout Editor, you can align them relative to each other.  Click on the Align menu item to view the alignment options:

There are several options for horizontal and vertical alignment. For example, if two or more objects are beside each other, choose Vertical Centers to align the graphs by their centers. To distribute, choose either Horizontal Spacing to place the graphs with equal spaces between the graphs or Horizontal Centers to place the objects with their centers equal distances apart. In addition, you can align by left, right, top or bottom. "Tops" means the top of every object is at exactly the same level.

The graphics and objects can be aligned to a grid, which is computed from the width of the objects themselves. The objects will be lined up into rows and columns according to their current position, and then spaced by their edges within the grid.

Group Command (under the Object menu)

Once you have elements of your layout positioned correctly, it may be desirable to Group the elements. This converts all of the individual graphs, lines, boxes and text into a single complex item that is more reusable and meaningful in future experiments.

To create a group, either use the arrow tool to encircle multiple items with a drag, or use the arrow tool in conjunction with the shift keys to create a multiple selection with successful clicking. Once multiple items are selected, use the Group command in the Object menu. If you change your mind, you can undo this by selecting the "Ungroup" command in the Object menu.