Problem/Motivation
Sample entity value generation generates long strings for text fields. This can cause the layout to break, as noted in #3016507: Break long text strings in layout edit
Proposed resolution
Rather than use \Drupal\Component\Utility\Random::word, which often generates very long words, use \Drupal\Component\Utility\Random::paragraphs, which uses words from a selection of shorter words.
Remaining tasks
Write a patch.
User interface changes
None-ish.
API changes
None
Data model changes
None