Remove translation from the title field
Yes, there is another way to do this in configuration. You can change

  translatable: true


in core.base_field_override.node.[content-type].title.yml.

If you don't find this configuration file, then there are no changes made so far for the title field. You can do this for example by modifying "Title field label" in the content type, which is also stored in this configuration and if it doesn't exist it will be created, so that you'll find the yaml in the exported config.

After you've changed the field label, export the configuration, open for each content type the mentioned yaml file, change translatable to false and reimport the configuration again.

See https://www.drupal.org/docs/8/configuration-management/workflow-using-the-drupal-ui or if you have installed drush use these two commands:

drush config-export
drush config-import


see https://www.drupal.org/docs/8/configuration-management/workflow-using-drush.