Plots > Working with Plots > Traces and Axis Expressions > To Move or Resize an Axis Legend
  
To Move or Resize an Axis Legend
1. On a plot, select the axis legend.
2. To resize the axis legend, move the pointer over the right border until it changes to . Click and drag the pointer horizontally until the axis expressions are positioned as desired.
3. To move the axis legend, click and drag the axis expression list to one of the specified locations. As you drag the list, the possible locations for the list are indicated by gray rectangles. Release the mouse after the rectangle of the new location has turned black. The plot region adjusts to fit the new axis legend position.
Possible locations for the x-axis expression list:
Possible locations for the y-axis expression list: