I see this topic has been discussed since at least 2014 and see there is at least one 2019 user with the same issue.  I am currently using SW2018 and am struggling to find a consistent, repeatable, non-random way to reposition the letter/label of a section view.  Sometimes Im able to move the letter/label independent of the section arrows, and other times I can click and click and click and click and Im not able to find the letter/label handle.  Has anyone discovered a consistent way to find that letter/label handle?