Embed not spanning the full width of the page

In a simple test page, I added an embed that references the link shown in the code snippet below. Unfortunately, the embed is not spanning the full width of my page, in a similar way to the paragraph block. I am pretty sure this was working, which is why I am reporting this here.

If this needs to be achieved with custom CSS then could this be documented somewhere.

To reproduce:

1. Create new page on blog ( Genesis Framework , Metro Theme
2. Add the default embed block with desired url.
In the html edit edit pane:

<figure class="wp-block-embed-wordpress aligncenter wp-block-embed is-type-wp-embed is-provider-cycling-locations"><div class="wp-block-embed__wrapper">
https://www.cyclinglocations.com/sa-calobra-climb-mallorca
</div></figure>

3. Preview ( and sigh) ?? as showing the mountain in half the page reduces the dramatic effect.

Note, I have also tried the WordPress embed without success.

Gutenberg 7.0
WordPress 5.3
Genesis Framework 3.2.1