Add clear "No background" option when formatting elements

[sarahhemmingsen]

Currently, to remove a background from an element (like a visual, shape, or text box), users must manually set the background transparency to 100%. This is unintuitive and inconsistent with typical design tools, where a simple “No background” or “None” option is standard.

Suggestion:
Introduce a clear “No background” toggle or option in the background formatting settings, alongside the color picker and transparency slider. This would make it easier and faster to remove background fills, without requiring the user to fine-tune transparency.