Hello. I'm a newer user and created a walking distance (isochrone) map for elementary schools within my city. It shows green, yellow and red for various walking distances around each school. I'd like to limit those to only the city or area code boundary, so that none of the red bleeds across the borders. Is there a way to do this? Thanks.
You can use the Analysis tools Overlay Layers tool to clip one layer to a polygon in another layer.
See this tutorial:
https://learn.arcgis.com/en/projects/clip-a-layer-in-map-viewer/