diff -u b/core/modules/views/views.views.inc b/core/modules/views/views.views.inc
--- b/core/modules/views/views.views.inc
+++ b/core/modules/views/views.views.inc
@@ -321,6 +321,9 @@
     }
   }
 
+  /** @var \Drupal\Core\Render\RendererInterface $renderer */
+  $renderer = \Drupal::service('renderer');
+
   // Description of the field tables.
   // @todo Generalize this code to make it work with any table layout. See
   //   https://www.drupal.org/node/2079019.
@@ -449,7 +452,12 @@
     }
     if ($aliases) {
       $data[$table_alias][$field_alias]['aliases'] = $aliases;
-      $data[$table_alias][$field_alias]['help'] .= ' ' . t('Also known as: @also.', array('@also' => implode(', ', $also_known)));
+      $result = [
+        '#type' => 'inline_template',
+        '#template' => '{% for item in items %}{% if not loop.first %}, {% endif %}{{ item }}{% endfor %}',
+        '#context' => ['items' => $also_known],
+      ];
+      $data[$table_alias][$field_alias]['help'] .= ' ' . t('Also known as: @also.', array('@also' => $renderer->renderPlain($result)));
     }
 
     $keys = array_keys($field_columns);
@@ -550,7 +558,12 @@
       }
       if ($aliases) {
         $data[$table_alias][$column_real_name]['aliases'] = $aliases;
-        $data[$table_alias][$column_real_name]['help'] .= ' ' . t('Also known as: @also.', array('@also' => implode(', ', $also_known)));
+        $result = [
+          '#type' => 'inline_template',
+          '#template' => '{% for item in items %}{% if not loop.first %}, {% endif %}{{ item }}{% endfor %}',
+          '#context' => ['items' => $aliases],
+        ];
+        $data[$table_alias][$column_real_name]['help'] .= ' ' . t('Also known as: @also.', array('@also' => $renderer->renderPlain($result)));
       }
 
       $data[$table_alias][$column_real_name]['argument'] = array(
diff -u b/core/modules/views_ui/src/ViewEditForm.php b/core/modules/views_ui/src/ViewEditForm.php
--- b/core/modules/views_ui/src/ViewEditForm.php
+++ b/core/modules/views_ui/src/ViewEditForm.php
@@ -1130,12 +1130,8 @@
         $last = end($keys);
         foreach ($contents as $key => $pid) {
           if ($key != $last) {
-            if ($group_info['groups'][$gid] == 'OR') {
-              $store[$pid]['#link'] = $this->t('@link    OR', ['@link' => $store[$pid]['#link']]);
-            }
-            else {
-              $store[$pid]['#link'] = $this->t('@link    AND', ['@link' => $store[$pid]['#link']]);
-            }
+            $operator = $group_info['groups'][$gid] == 'OR' ? $this->t('OR') : $this->t('AND');
+            $store[$pid]['#link'] = SafeMarkup::format('@link <span>@operator</span>', ['@link' => $store[$pid]['#link'], '@operator' => $operator]);
           }
           $build['fields'][$pid] = $store[$pid];
         }
only in patch2:
unchanged:
--- a/core/modules/views_ui/css/views_ui.admin.theme.css
+++ b/core/modules/views_ui/css/views_ui.admin.theme.css
@@ -512,6 +512,14 @@ td.group-title {
   margin-right: 0.2083em;
 }
 
+.views-ui-display-tab-setting > span {
+  margin-left: 0.5em; /* LTR */
+}
+[dir="rtl"] .views-ui-display-tab-setting > span {
+  margin-left: 0;
+  margin-right: 0.5em;
+}
+
 /** Applies an overridden(italics) font style to overridden buckets.
  * The better way to implement this would be to add the overridden class
  * to the bucket header when the bucket is overridden and style it as a