I find that when grouping some elements in Gutenberg, the setting of Wide width and Full width do not appear to result in a particularly different width of content. Whilst each option does produce a different container class; wp-block-group and wp-block-group alignfull respectively, they also both put their content in the same subsequent container with .wp-block-group__inner-container which does not allow for rendering the Full width of the browser viewport, such that my wave SVG does not reach the edge of the viewport.
My intention is to group some elements, some with limited width others not, in a container that IS full width and give that container a different background colour.
I’ve installed the GenerateBlocks beta and have been very productive with the containers. That’s a great help indeed.
I have found it a little bit fiddly to select the nested containers and move blocks in and out of nested positions, but I have been able to achieve all my goals eventually with a little trial and error.