Can I choose what my mobile app shows while a page is loading?

Yes, you can pick the loader under App Behavior.

1. Go to Settings → App Settings → Logo & Splash Screen.
2. In App Behavior, open Loader style and pick Skeleton (recommended), Spinner or Loader image.
3. If you pick Loader image, a Loader image box appears. Click it and choose your image.
4. Click Save Changes.

The same section also has Infinite-scroll page size (how many products load at a time, 1 to 100, default 20), Enable image caching and Enable offline mode. If you leave them blank or off, the app uses its built-in defaults.