diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
index cb5ae744..94be599e 100644
--- a/DOCUMENTATION.md
+++ b/DOCUMENTATION.md
@@ -1288,6 +1288,7 @@ Renders the search form with advanced options (if not disabled in the settings).
 * **simple:** Set `true` to hide the advanced search options. Default `false`.
 * **placeholder:** Change the placeholder text.
 * **type:** Preselect either "any", "story", "chapter", "recommendation", "collection", or "post".
+* **expanded:** Whether the advanced form is expanded. Default `false`.
 * **tags:** Preselect tags as comma-separated list of term IDs.
 * **genres:** Preselect genres as comma-separated list of term IDs.
 * **fandoms:** Preselect fandoms as comma-separated list of term IDs.
diff --git a/includes/functions/_setup-shortcodes.php b/includes/functions/_setup-shortcodes.php
index a1d5f81d..0024e667 100644
--- a/includes/functions/_setup-shortcodes.php
+++ b/includes/functions/_setup-shortcodes.php
@@ -1378,6 +1378,8 @@ function fictioneer_shortcode_search( $attr ) {
   $pre_warnings = fictioneer_explode_list( $attr['warnings'] ?? '' );
 
   // Prepare arguments
+  $args['expanded'] = filter_var( $attr['expanded'] ?? 0, FILTER_VALIDATE_BOOLEAN );
+
   if ( $simple ) {
     $args['simple'] = $simple;
   }
diff --git a/searchform.php b/searchform.php
index 40d37296..a30e1c4d 100644
--- a/searchform.php
+++ b/searchform.php
@@ -7,8 +7,10 @@
  * @since 5.0.0
  * @since 5.11.0 - Added 'fictioneer_search_form_filters' action hook.
  * @since 5.19.0 - Added taxonomy preselect arguments.
+ * @since 5.23.1 - Added expanded argument.
  *
  * @internal $args['simple']                Optional. Hide advanced options.
+ * @internal $args['expanded']              Optional. Whether the advanced form should be expanded. Default null|false.
  * @internal $args['placeholder']           Optional. Change search placeholder.
  * @internal $args['preselect_type']        Optional. Default post type to query.
  * @internal $args['preselect_tags']        Optional. Default tag IDs to query.
@@ -109,7 +111,13 @@ if ( $show_advanced ) {
   method="get"
   class="search-form <?php if ( ! $show_advanced ) echo '_simple'; ?>"
   action="<?php echo esc_url( home_url( '/' ) ); ?>"
-  data-advanced="<?php echo ( is_search() && $show_advanced && $no_params ) ? 'true' : 'false'; ?>"
+  data-advanced="<?php
+    if ( $args['expanded'] ?? 0 ) {
+      echo 'true';
+    } else {
+      echo ( is_search() && $show_advanced && $no_params ) ? 'true' : 'false';
+    }
+  ?>"
 >
 
   <?php if ( $show_advanced ) : ?>