Again, my short walls are set in concrete and type S mortar.
This wall was intended to look like a dry stack wall. The mortar is on the back 2/3rds of each course. If any mortar is showing, then I use a wire or point-tuck trowel to remove any mortar showing.
Notice the bags of concrete and mortar sitting on a tarp and pallet in one of the photos.
Take a close look and you might see mortar in my joints.