SmartDraw automatically adjusts the spacing of Automatic Shape Connectors.
You can manually adjust the spacing of:
Begin by clicking on the spine to select it and some handles appear along its length.

Click and drag the two black bars found at the intersection between
the last cause and the spine to adjust the length of the entire spine. The spacing between the causes is kept
even.
Click and drag the black square at the intersection of the rightmost
cause and the spine to adjust the length of the spine between that handle and the "effect" box on the far right.
Drag the black square handle on any cause branch to evenly adjust the length of all causes in the visual.
Click and drag a white diamond-shaped handle between two causes
to change the length of the spine only between those causes.
Begin by clicking on a cause branch and handles appear.

Click and drag a black square handle along the cause branch to
change the position of the details on the branch.
Drag a black square handle near the text of a detail to change the length of all detail branches on this cause.