diff -u b/core/modules/taxonomy/src/Plugin/EntityReferenceSelection/TermSelection.php b/core/modules/taxonomy/src/Plugin/EntityReferenceSelection/TermSelection.php
--- b/core/modules/taxonomy/src/Plugin/EntityReferenceSelection/TermSelection.php
+++ b/core/modules/taxonomy/src/Plugin/EntityReferenceSelection/TermSelection.php
@@ -46,7 +46,6 @@
       '#type' => 'checkbox',
       '#title' => $this->t("Create referenced entities if they don't already exist"),
       '#default_value' => isset($this->configuration['handler_settings']['auto_create']) ? $this->configuration['handler_settings']['auto_create'] : FALSE,
-      '#prefix' => '<hr>',
     );
 
     // Sorting is not possible for taxonomy terms because we use
only in patch2:
unchanged:
--- a/core/modules/system/css/components/form.theme.css
+++ b/core/modules/system/css/components/form.theme.css
@@ -96,3 +96,9 @@ abbr.ajax-changed {
   background: url(../../../../misc/icons/ea2800/error.svg) no-repeat;
   background-size: contain;
 }
+
+/* Special separator */
+.form-item-settings-handler-settings-auto-create label {
+  border-top: 1px solid #ccc;
+  padding-top: 5px;
+}