There may be occasions when you want two characters' Dialogue to appear side by side in the script. For example, when two characters are speaking at the same time, with their dialogue overlapping.
NOTE: While Screenwriter can print Dual-Column Dialogue lined up correctly, it displays it onscreen sequentially. The left column paragraph displays, then the right column paragraph, and so on.
Example: Writing in dual column mode in Screenwriter looks like this on screen...
...but prints in the document like this: