The V Flex and H Flex elements are div blocks that have been pre-set to flexbox. These elements let you design with flexbox more efficiently.
V Flex is set to vertical flexbox, which means that child elements placed in the div will flow vertically (i.e., up to down). H Flex is set to horizontal flexbox, which means that child elements placed in the div will flow horizontally (i.e., left to right). You can access these elements in the Add panel > Structure section.
