Split legend 
By right clicking anywhere on the legend, the following
shortcut menu appears:
Choose ‘Split legend’ and the legend gets divided into its
rows.
You can move each row individually by
dragging its upper left corner, in order to place them near the corresponding
measurements.
In case you
want to move simultaneously more than one rows of a legend that has been split,
you must select them all and then press the ‘move selection’ button.