Final answer:
To change the symbology of a map layer, one can adjust the font size or modify the layer's color scheme. Changes like altering the paper size or software version do not directly affect symbology.
Step-by-step explanation:
The potential ways to change the symbology of a map layer include:
Adjusting the font size: This doesn't directly alter the map's symbology but can affect how text labels are viewed.
Modifying the layer's color scheme: This is one of the primary methods of changing a map's symbology, as it alters how features and classifications are visually represented.
Changing the paper size of the map: This affects the overall map layout and scale but does not directly change the symbology.
Updating the software version: While a newer software version may offer more sophisticated symbology options, it does not change the symbology of the map layer itself without user intervention.
Therefore, the primary ways to change a map layer's symbology are through adjusting the font size (to a limited degree) and more effectively by modifying the layer's color scheme.