In comment_entity_info() the comment module is specifying in "entity keys" that its bundle is "node_type", but there is no corresponding column in the comment table. That makes it impossible to query comment entities by bundle without pulling in the node information that each comment is attached to.
GitHub Issue #:
2046
Recent comments
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?
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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?