To have text alignment follow the language used when the text was first entered or the user interface language, click General.
To set a fixed alignment, click one of the other choices.
Note CTRL+LEFT SHIFT and CTRL+RIGHT SHIFT shortcut keys used to dynamically change reading order and alignment in other bidirectional programs will temporarily change reading order only (alignment is not changed because changing alignment might negatively affect appearance). When the focus leaves the control, the display format returns to the previous control reading order.