Legend visibility for time axes controls if TimeAxe tickmarks are shown on each panel, or on the
bottom panel only.
Tip : You may ajust any layout by modifying settings while plotting empty panels.
Vertical Layout
Vertical Layout is more flexible in defining panel sizes. It allows the individual panel size to be defined even at
the panel level.
But it is really "Vertical Layout" - several XY panels cannot be plotted at the same "row".