In this example, we have 3 Text elements, but only two are displayed.  The first element contains the text you are reading now.  The second Text element is configured to display only on small devices and the third Text element is configured to display on device sizes that are considered medium and larger.

If you adjust your browser width down to smartphone size, you'll see how the medium and up text that is currently displayed gets replaced by the small text section.

Small Only

Donec sit amet scelerisque arcu. Phasellus vitae dui cursus, vehicula nulla vel, ultricies libero. Nulla facilisi. Ut in tempus urna. In ultrices neque turpis, et facilisis augue faucibus eu. Donec venenatis nisi quis purus gravida, sed rutrum odio congue. Nullam dapibus rhoncus lobortis. Aliquam erat volutpat. Donec tincidunt et nunc ac volutpat. Integer sagittis velit lectus, in tincidunt leo scelerisque et. Mauris porttitor tellus in faucibus pellentesque. Curabitur eget vehicula sem, in ultrices urna.

Medium and Large Only

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eget magna auctor turpis dapibus molestie. Donec tincidunt, nulla a malesuada tristique, velit lacus fermentum nibh, non elementum risus erat ac urna. Nunc accumsan lobortis porta. Quisque tristique tempor dignissim. Fusce a neque nisl. Vestibulum semper dui ut sapien blandit pharetra. Vestibulum orci mauris, fringilla eu condimentum sit amet, semper vel diam. Proin molestie ex vel justo rhoncus, vitae aliquam lorem cursus. Vestibulum erat tellus, tempor vitae ex a, hendrerit commodo turpis. Aliquam porta, nisi at condimentum viverra, purus tellus facilisis augue, vitae imperdiet nibh quam sit amet ligula. Nam dignissim, lorem ut aliquam feugiat, ligula nulla blandit nisl, rutrum vulputate purus tortor quis nunc. Nunc purus nunc, porttitor a eleifend at, ultricies a enim.