You can use the following mouse actions to shift all or
some of the elements in a sequence diagram.
Shifting the entire diagram upward or downward
Procedure
Verify that an instance line is not currently
selected.
Position the mouse in the area above the
classifier role names.
Press Shift and drag the mouse up to shift
the entire diagram upward, or drag down to shift the entire diagram
downward.
Shifting groups of elements upward or downward
Procedure
Verify that an instance line is not currently
selected.
Position the mouse above the highest element
that you want to shift.
Press Shift and drag the mouse up to shift
the element and all the elements below it upward, or drag down to
shift the element and all the elements below it downward
Shifting groups of instance lines to the left or right
Procedure
Select any of the instance lines in the
diagram.
Position the mouse to the left of the instance
lines that you want to shift.
Press Shift and drag the mouse to the right
to move all the elements on the right side of the mouse cursor to
the right. Press Shift and drag the mouse to the left to move all
the elements on the right side of the mouse cursor to the left.
Note: If you place the mouse on an instance line
and drag while the Shift key is held down, the product shifts the
instance lines on the right of that instance line but not that instance
line itself. "On an instance line" includes the entire width below
the box that contains the name of the classifier role.