Show the site menu in the “Related To” condition rule modal.

CHANGELOG-WIP.md

@@ -13,7 +13,8 @@
 - Pressing <kbd>Return</kbd> when an inline-editable field is focused now submits the inline form. (Previously <kbd>Ctrl</kbd>/<kbd>Command</kbd> had to be pressed as well.) ([#15841](https://github.com/craftcms/cms/issues/15841))
 - Improved the styling of element edit page headers, for elements with long titles. ([#16001](https://github.com/craftcms/cms/pull/16001))
 - It’s now possible to preview audio and video assets from Edit Asset screens. ([#16021](https://github.com/craftcms/cms/pull/16021))
-- Sidebar visibility states are now stored in a browser cookie, so they are retained between page/slideout loads. ([#16025](https://github.com/craftcms/cms/pull/16025), [#15982](https://github.com/craftcms/cms/discussions/15982))  
+- Sidebar visibility states are now stored in a browser cookie, so they are retained between page/slideout loads. ([#16025](https://github.com/craftcms/cms/pull/16025), [#15982](https://github.com/craftcms/cms/discussions/15982))
+- “Related To” condition rules now show the site menu in element selector modals. ([#16036](https://github.com/craftcms/cms/pull/16036))
 
 ### Accessibility
 - Improved the control panel for screen readers. ([#15665](https://github.com/craftcms/cms/pull/15665))
@@ -61,6 +62,7 @@
 - Added `craft\base\NestedElementTrait::saveOwnership()`. ([#15894](https://github.com/craftcms/cms/pull/15894))
 - Added `craft\base\PreviewableFieldInterface::previewPlaceholderHtml()`.
 - Added `craft\base\RequestTrait::getIsWebRequest()`. ([#15690](https://github.com/craftcms/cms/pull/15690))
+- Added `craft\base\conditions\BaseElementSelectConditionRule::elementSelectConfig()`.
 - Added `craft\console\Controller::output()`. 
 - Added `craft\console\controllers\ResaveController::hasTheFields()`.
 - Added `craft\elements\db\NestedElementQueryTrait`. ([#15894](https://github.com/craftcms/cms/pull/15894))

src/base/conditions/BaseElementSelectConditionRule.php

@@ -63,6 +63,26 @@ protected function criteria(): ?array
         return null;
     }
 
+    /**
+     * Defines the element select config.
+     *
+     * @return array
+     * @since 5.5.0
+     */
+    protected function elementSelectConfig(): array
+    {
+        $element = $this->_element();
+        return [
+            'name' => 'elementId',
+            'elements' => $element ? [$element] : [],
+            'elementType' => $this->elementType(),
+            'sources' => $this->sources(),
+            'criteria' => $this->criteria(),
+            'condition' => $this->selectionCondition(),
+            'single' => true,
+        ];
+    }
+
     /**
      * @param bool $parse Whether to parse the value for an environment variable
      * @return int|string|null
@@ -125,17 +145,7 @@ protected function inputHtml(): string
             ]);
         }
 
-        $element = $this->_element();
-
-        return Cp::elementSelectHtml([
-            'name' => 'elementId',
-            'elements' => $element ? [$element] : [],
-            'elementType' => $this->elementType(),
-            'sources' => $this->sources(),
-            'criteria' => $this->criteria(),
-            'condition' => $this->selectionCondition(),
-            'single' => true,
-        ]);
+        return Cp::elementSelectHtml($this->elementSelectConfig());
     }
 
     /**

src/elements/conditions/RelatedToConditionRule.php

@@ -51,6 +51,16 @@ public function getExclusiveQueryParams(): array
         return [];
     }
 
+    /**
+     * @inerhitdoc
+     */
+    protected function elementSelectConfig(): array
+    {
+        return array_merge(parent::elementSelectConfig(), [
+            'showSiteMenu' => true,
+        ]);
+    }
+
     /**
      * @inheritdoc
      */