UI Components / Backdrop Spinner
In your Backendless App, go to the Marketplace -> User Interface tab and install the Backdrop Spinner componentInstall the component to the UI Container of your choice

Backdrop Spinner

Backdrop Spinner is the component for Backendless UI Builder that
represents a background with a loader in the center of it.

The component is customizable,
allowing you to choose the type of the loader.

UI Components / Backdrop Spinner