How can I manually sort the legend key?

[Dani]

I am trying to change the order my legend key is displayed? There should be
an obvious feature for this, but I cannot seem to find it? Any idea?

 

[Jon Peltier]

You can rearrange the order of the series in the chart, but the order of the
legend entries is constrained beyond this. You cannot switch the order of
two series if one is on the primary axis and the other on the secondary, or
if the two series represent two different chart types (e.g., line vs,
column).

- Jon