Agile Store Locator has a radius circle that appears for the selected range of the dropdown, the radius circle only appears when a search is performed, and the distance dropdown option is enabled, in order to make the radius circle appear, please enable the following options.
1- Enable the Radius Circle from the ASL Settings > Maps.
2- Enable the Advance Filter & Distance Control in the ASL Settings > General tab.
3- Choose the Dropdown for the distance filter and add your values to appear in it.
4- Once you enable these settings, save the settings.
Now, once you will perform a search the radius circle will appear, and the map will fit bound to the selected range of the distance, to change the color of the radius circle, please follow the document about how to change the radius circle color.