When an equation breaks across lines, the entire equation remains in a single anchored frame. You can set where an equation breaks across lines automatically. When you change the line-break width, the equation is reformatted to the new width.
You can also force a line break at a specific location in the equation. However, don’t use manual line breaks to create separate equations. Instead, insert a vertical list of expressions.
You can change line breaking in these ways:
To change the automatic line break width, click in the equation or select any part of it. Choose Automatic Line Break After box, and click Set. The value is preset to the width of the equation frame.
. Edit the value in theTo remove a manual line break, select the part of the equation that contains the line-break symbol. On the Positioning page of the Equations panel, choose Clear Manual from the Line Breaking drop-down list.