A box is an item you have already seen in last version, however, in version 2018 there is a completely different usage and properties of boxes. Adjustments start already on home page. Right menu, where the boxes could have been displayed, has been deleted. Boxes always contain name and text and may contain button in the bottom part. In case you do not fill in link for button, the button is not displayed. Anew you cannot use more than two boxes due to their overuse in the past. In case you activate more than two boxes in you list of boxes, only first two boxes in the list are displayed, rest is ignored. For box setting go to CMS3 > Website > Home > Boxes.