Hello sbernad11,
There is no way to turn off or modify layers of the World Topographic Map because it is meant to be used as a reference map in the background with data overlaid on top of it. Please feel free to utilize this map and add your own layers so it can be useful to your work.
Thank you,
Tamara Yoder
Tamara Yoder, Geospatial Analyst
Esri, 380 New York Street, Redlands, CA 92373 USA
T 909-793-2853, ext. 5028, tyoder@esri.com, esri.com