In reply to Lukasz.

I don't have any links, but the "content" and "wide" overrule the content and wide sizes from theme.json for that specific Group. So, let's say you set the content size to 400px and wide size to 600px. Nested blocks will have a default max-width: 400px. However, if you set a nested block to wide alignment, it will have max-width: 600px.

Here's a screenshot for reference: