For anybody looking to style the progress indicator; you can style this progress indicator in custom-variables.js within ProgressOverlay:
progressOverlay: {
color: font.colorTitle,
activityIndicatorColor: brand.primary,
backgroundColor: "rgba(0, 0, 0, 0.5)",
containerBackgroundColor: background.secondary,
fontSize: font.sizeSmallest,
borderRadius: border.radiusSmall,
elevation: 1.5,
shadowColor: "#000",
shadowOpacity: 0.1,
shadowRadius: 10 // Only for iOS
}
If you would like to show extra context while waiting, you might want to check out progress circle or progress bar. You can change the values of those widgets inside a nanoflow to show the progress while the user is waiting. There are some styling options within these widgets available.