I am experiencing issues with the WP Block Editor where Toolset Blocks (such as the Image and Container Blocks) display extremely narrow, preventing proper dynamic content selection, and I cannot integrate post relationships or Toolset Maps with Elementor.
Solution:
Go to Toolset > Settings > General and enable legacy mode to use shortcodes for dynamic views; then, in the WP Block Editor click the Toolset icon at the upper right and adjust the "Editor Maximum Width" from 1% to 90% to restore a usable interface, and deactivate other plugins to rule out conflicts if necessary.