Just revisiting this.
I have been playing with the Graph+ today and noticed that created(saved) graphs cannot be deleted from the graph+ GUI.
Tried to rename a graph and it saved it as a new graph.
Tried very basic name, 5 letters, no spaces, no special characters. Makes no difference.
Tried removing all data input fields, saving, and then deleting, no dice.
East to delete in the file manager GUI so it is no real “issue” I guess.