With certain HTML/CSS skills, you can customize Store Locator app yourself according to the following file:
Templates/page.sca-storelocator.liquid or Sections/sca-storelocator.liquid
Assets/sca.storelocator.css
assets/sca.storelocator.css
assets/sca.location-map-mobile.png
assets/sca.location-find-location.png
assets/sca.location-origin-marker.png
assets/sca.location-arrow-up.png
assets/sca.location-arrow-down.png
assets/sca.location-loading.png
assets/sca.stockist-form-loading.png
assets/sca.ty-thumbnail.png
snippets/sca.storelocator.liquid
templates/page.sca-storelocator.liquid (optional)
templates/page.sca-storelocator.json (optional)
sections/sca-storelocator.liquid (optional)
assets/sca.storelocator_scripttag (optional)
assets/sca.dealerform_scripttag (optional)
assets/sca.wtb_scripttag (optional)
assets/sca.storelocatordata.json (optional)
assets/sca.api.storelocator.css
templates/page.sca-stockistform.json
sections/sca-stockistform.liquid