I've set up a number of features (simple points and lines) within multiple layers (within group layers) on my ArcGIS Online map. Within Map Viewer, whenever i go to Layer and click on 'Zoom to', I expect the map to zoom in to the small area the features are within (e.g a postcode in London), however the map zooms out to larger than the entire world. When the same is tried on map viewer classic, it works fine.