Decreases the number of the paragraph outline level.
The ALT+SHIFT+LEFT ARROW keyboard shortcut executes the DecrementParagraphOutlineLevelCommand command.
The DecrementParagraphOutlineLevelCommand command will decrease the paragraph outline level number without changing the text style if the initial text style does not belong to the default Heading styles and one of nine available outline levels is set to the paragraph.
Otherwise (for example, if one of the default Heading styles has been initially applied to the paragraph), DecrementParagraphOutlineLevelCommand will change the paragraph style to the previous-level Heading style.
To increase the paragraph outline level, use the IncrementParagraphOutlineLevelCommand command.