Author: AristosQueue (NI)
Right-click on a cluster constant and choose Visible Items >> All Element Labels. This will arrange the clustered items vertically with their labels visible. Notice in the picture that if an item doesn't have a label (empty string), you still get a region where you can double click to type the label directly.
Before:
After:
Attachement is saved in LabVIEW 2015. For install instructions, go here.