This method can be applied to show posts of any post type grouped by a corresponding taxonomy (built-in or custom), not just posts and categories.
In this example, we are showing post titles linking to their permalinks. Since we aren't using a Code element for outputting the loops we have full flexibility to visually develop the loop content by placing the various elements that Bricks builder provides.
Copy and paste the Section from our test site using this JSON.
For the outer loop Block, the query type is set to Terms → Categories.
For the inner loop Block, the query type is set to Posts.
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