Rearrange the columns in the Legend

The Legend contains information about a trend such as the parameter reference, value, descriptor, timestamp, and so on, which help you to read the graph. You can add and remove Legend columns and rearrange column position. By default the Parameter Reference column always appears in the Legend and is always in the first position.

Be sure that the Legend is showing (View → Legend).
Right-click in the Legend, and then select Legend Columns.
In the Assigned Columns list, select the Legend column that you want to reposition and click the Up button to move the selection up in the list (closer to the default first column, Parameter Reference), or click the Down button to move the column down in the list.