I am unsure of the places that core uses the taxonomy_index.
However, I do know that its pretty useless unless you only care about node references to taxonomy terms.
The module taxonomy_entity_index exists to fix this problem for Drupal 7.
I would wager that since Entity API is in backdrop, you'd want this functionality.
GitHub Issue #:
103
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A simple way — use Field Group to create a container for fields https://backdropcms.org/project/field_group and CSS Flex оr Grid to alignment.
Layout also for /node/add/ forms?
Yes. The are several ways to do this: Install Mail System and select "Testing" for delivery in admin/config/system/mailsystem Install Maillog / Mail developer...
Prevent Backdrop from sending emails
The short answer is no, you can't theme forms or change their layouts through the UI. There is a ported version of Display Suite, which has a submodule called Display Suite Forms that allows you...
Layout also for /node/add/ forms?