This map represents a subset image of Thematic Mapper data provided in a lab exercise that allowed us to familiarize ourselves with ERDAS Imagine.  We selected this area and used ERDAS Imagine to calculate the area of each vegetation type in hectares.  We then transferred that image and it's associated data over to ArcGIS Pro and created this layout.  I listed the vegetation types in the legend from low to high in terms of total hectares.  I rounded up to the nearest hectare to keep it looking neat.