You can change the alignment of text in a balloon or caption so that text is aligned to the left or right border, centered, or aligned on both left and right (justified).
Use the Alignment buttons in the format bar to quickly change the alignment of text in your document. To change the alignment of text, select the text, and then click the Alignment buttons in the format bar.
Align Left: Places each line of text against the left margin of the element.
Center: Sets the center of each line of text at the center of the element.
Align Right: Sets the line of text against the right margin of the object.
Justify: Spaces characters in each line so that the lines reach both the left and right margins of the object.
You can also align text horizontally by choosing Format->Text->Align Left, Center, Align Right, or Justify.