The 'ROTATE MODE' allows you to rotate branches or subtrees of the displayed tree.
Click on the <button in the left column> of the 'ARB_NT' window to activate the 'ROTATE MODE'.
Simply click and drag a branch to rotate it. Please note this only has an effect for radial tree display.
To reset the rotation of all branches of a subtree, press the key '0' (zero) while pointing to that subtree.