There are two separate Legends which are used in the Slide Interpret program:
The groundwater contour Legend indicates the values of the contours (e.g. Pressure Head, Total Head, etc), which are displayed on the model after a groundwater analysis.
The safety factor Legend indicates the values of the safety factor contours within slip center grids used for a circular slip surface Grid Search.
The Legend Options in the Groundwater menu is used to configure the options for the groundwater contour Legend.
For a discussion of the Legend Options, see the Legend Options topic in the View menu section of this Help system, as the options are the same for both the safety factor Legend and the groundwater contour Legend.
TIP: shortcuts to the Legend Options and Contour Options, are available if you right-click the mouse ON the groundwater contour Legend.