to get to the map control follow the path below
now the Map slider controls the opacity - play with it and see how it works
the color on the state can be varied by edit color then use the slider on the color card
you get this
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The 'layer' that you are looking at is the background map. Any layers that you place over this background map is going to cover these names, however there are a couple of tricks you can use (other than Arvindgarg's solution which is probably the best);
In the Map Layers menu, (Map > Map Layers) if you turn on a Data Layer, the text of the background names goes darker.
You can also hit this from the other end and alter the opacity of the map colour in order to be able to read the background text.