The vast majority of masonry walls designed to resist out-of-plane bending are supported at the top and bottom, spanning vertically. Once you start looking at designs where a wall is spanning horizontally between columns, intersecting walls, or other supports, you are no longer within the scope of MASS.
This does not mean that MASS cannot be a useful tool in designing a horizontally spanning wall! Continue reading to see how you can manipulate the software to assist you in your design.