When playing back synchronized text in Presentation Mode, depending on the pane view, you may wish to left justify or center the displayed text.
Choose this option to left justify the line on screen text. De-select the option to center the text on screen.
You may also set this option from the Presentation screen by right clicking on the synchronized text window.
In general, if you are displaying text and including line numbers, it's best not to center the text. If you are not displaying line numbers, centering the text is often easier to read. See the topic Show Line Numbers for information on the line number setting.