Hi Justin, and thank you for taking the time to try out the theme. The feedback is really appreciated.

The No Bottom Margin style for the columns block is there because Gutenberg styles the columns with a 1.75em bottom margin, so thought it might be helpful to remove it with a block style. This way it is optional as any site that already has columns with content immediately below does not find the content pushed right up against the end of the columns.

"The theme includes a Narrow Width style for the Group block that corrects this. However, it would ideally be the reverse, with the content defaulting to a narrower width."

All the templates and template parts are wrapped with a full-width group block, and a nested wide group block. With this you can go into the Site Editor, select the single post template, and change the inner wide group block to the Narrow Width style if you want single posts to display in the narrower width by default.

I believe the template parts will be grouped into areas such as header, footer, and general/uncategorized in a future Gutenberg release.