Which option modifies the widget design to not show an icon and have a white heading background?

The choice that modifies the widget design to not show an icon and have a white heading background is Simple. This design option typically streamlines the appearance of the widget by removing visual clutter like icons, which makes it ideal for a clean and minimalist presentation. Additionally, the configuration to have a white heading background enhances readability and aligns with a straightforward aesthetic.

In contrast, the other options likely include additional features or elements that wouldn't meet the criteria of a simplified widget design. For example, the Default option might retain standard icons and backgrounds, while Color could introduce more visual elements that detract from a minimalist look. Custom might allow for a bespoke design, but it doesn't guarantee the specific characteristics of eliminating icons and a white heading background unless explicitly configured to do so. Therefore, the Simple option is the most appropriate choice for this specific modification.