Issue #3347728: Bring back the admin label on the block

src/Plugin/Block/ConfigurableViewsExposedFilterBlock.php

@@ -43,6 +43,14 @@ class ConfigurableViewsExposedFilterBlock extends CoreViewsExposedFilterBlock {
   public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
     $form = parent::buildConfigurationForm($form, $form_state);
 
+    // ViewsBlockBase overrides and hides the admin label, as it assumes only
+    // one instance. Since this module adds support for multiple instances, we
+    // actually want to use it.
+    $definition = $this->getPluginDefinition();
+    $form['label']['#default_value'] = $this->configuration['label'] ?? $definition['admin_label'];
+    $form['label']['#access'] = TRUE;
+    $form['id']['#access'] = TRUE;
+
     // Visible filters.
     $this->buildFilterConfigurationFormOptions($form, $form_state);