Problem/Motivation
Currently \Drupal\node\NodeForm::form() and seven_form_node_form_alter() work to split the node form into two columns.
This code runs after the entity display.
If using the experimental Field Layout module to change node forms to have two columns, this will incidentally create 3 columns.
Additionally, form_alter implementations that relocate fields will have conflicts
Proposed resolution
Configure node.module to use a layout for node displays