FractionBoxOptions

is an option that specifies settings for FractionBox objects.

Details

AllowScriptLevelChange	True	controls whether certain operators, such as ∑, ∏, and ∫, always appear smaller than normal size
BaseStyle	{}	base style specifications
FractionLine	Automatic	specifies the thickness of the line separating the numerator and denominator
MultilineFunction	Automatic	specifies whether the numerator or denominator is split across multiple lines if it is too long to fit on a single line

A fraction can be created using or the Insert ▶ Typesetting ▶ Fraction menu item.
With the default setting MultilineFunction->Automatic, the numerator or denominator may be reformatted to extend across multiple lines. This may involve converting the two-dimensional fraction into a fraction that uses a "/". The point at which the line break is applied is indicated by a  symbol.
With the setting MultilineFunction->LineWrapParts, the numerator or denominator is linewrapped to fit in the available space, while retaining the two-dimensional form of the fraction. The point at which the line break is applied is indicated by a  symbol.
With the setting MultilineFunction->None, the numerator or denominator is not split across multiple lines.
For a selected fraction, MultilineFunction is set as an option of the FractionBox object, and applies only to the selection.
MultilineFunction is set as a suboption of the FractionBoxOptions option. It specifies the default setting of MultilineFunction for any FractionBox.

Modify color and size for fraction boxes in a cell:

Display a cell with and without script level changes:

Remove fraction line:

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