Continuous raster legends sort in descending order (high values on the top and low values at the bottom) by default. Classified raster legends display in whatever order the raster handler provides.
The sort order for all raster legends can be changed to ascending, descending, or to the original sort order. To do this:
- Right-click on the legend frame and select Modify Legend Frame Properties.
- In the Legend Frame Properties dialog, change the sort order by clicking the Sort Labels in Ascending Order, Sort Labels in Descending Order, or Clear all Label Ordering button.