https://api.drupal.org/api/drupal/core%21modules%21field%21tests%21modules%21field_test%21src%21Plugin%21Field%21FieldFormatter%21TestFieldPrepareViewFormatter.php/function/TestFieldPrepareViewFormatter%3A%3AsettingsForm/8.9.x
function TestFieldPrepareViewFormatter::settingsForm | Drupal API
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