The angle of the Labels. Initially the branches connected to the tips will point to the middles of the labels. If you want to change the way the labels are drawn, the program will offer you a choice between Fixed, Middle, Radial, and Along as the ways the angles of the labels are to be determined. However there are additional options. Middle has the branch connected to that tip point to the midpoint of the label.
Radial indicates that the labels are all aligned to as to point toward the root node of the tree.
Along aligns them to have the same angle as the branch connected to that tip. This is particularly likely to keep the labels from colliding, but it may give a misleading impression that the final branch is long. The rotation of the tree. This is initially 90.0 degrees. The angle is read out counterclockwise from the right side of the tree, so that increasing this angle will rotate the tree counterclockwise, and decreasing it will rotate it clockwise.