Hi! Developer here 👋
You can hide the control buttons using the custom CSS widget by adding:

.controls {
display: none;
}


I’ll also fix this so that when there’s only a single image, the controls won’t be shown at all.

For future issues or questions, it’s much better to reach out via GitHub rather than leaving a review, that way we can actually help and track the problem properly. Also worth noting: someone specifically requested having controls on media backgrounds there.