WP Show Posts Documention using block editor

I'm just starting to learn WP Show Posts:

1. Is there a good tutorial that takes into account the new block editor? The Vimeo video on the front page of the plugin site (around :40) shows a toolbar with what appears to be a WP Show Posts icon. How do I access that in the block editor?
2. Once the shortcode is inserted, a list of test posts appear (in the same video at :51) that all have images in them. Are those images just featured images in each of the posts that are in the list?

Thanks