The Pack Horizontally menu item takes a set of selected shapes and "packs" them into the smallest space possible horizontally.
This option is enabled when three or more unlocked figures are selected in the drawing canvas. Complete the following steps to pack a set of figures horizontally:
Select the figures or shapes to be packed horizontally.
Then click on the Arrange Menu, select the Distribute Submenu, and choose Pack Horizontally.
The following image displays the positions of a selected set of figures after using the Pack Horizontally option.