why using React.useMemo with modalProps

[alexzhou-chata]

const modalProps = React.useMemo( () => ({ styles: modalPropsStyles, isModeless: true, dragOptions: isDraggable ? dragOptions : undefined, }), [isDraggable], );
This was copied from the Fluent UI react Dialog
Why the useMemo being used here?
I know it can solve the performance issue, but why with this specific props?
Thank you!