devel-4.x-dev/config/install/devel.settings.yml

page_alter: FALSE
raw_names: FALSE
error_handlers:
  1: 1
rebuild_theme: FALSE
debug_mail_file_format: '%to-%subject-%datetime.mail.txt'
debug_mail_directory: 'temporary://devel-mails'
devel_dumper: 'default'
debug_logfile: 'temporary://drupal_debug.txt'
debug_pre: TRUE