hi paul,
thanks for your update.
according to the picture you provided, we would like to tell you that it is not feasible to achieve the map structure you mentioned. however, we can check the hierarchy of the site by enabling tree view and content and structure.
about tree view, please refer to the structure below:
besides, by default, the "content and structure" feature is not available until you activate the "sharepoint server publishing infrastructure" site collection feature from site collection administration.
to activate this feature, go to site settings > site collection administration > site collection features > activate sharepoint server publishing infrastructure
once you activate the feature, content and structure will show up in site administration.
regards,
yoga