diff --git a/includes/Constants.php b/includes/Constants.php
index 6527da3..0f6d0a3 100644
--- a/includes/Constants.php
+++ b/includes/Constants.php
@@ -55,6 +55,18 @@ final class Constants {
 	public const CONFIG_KEY_DEFAULT_SKIN_VERSION_FOR_NEW_ACCOUNTS =
 		'VectorDefaultSkinVersionForNewAccounts';
 
+	/**
+	 * @var string
+	 */
+	public const CONFIG_KEY_DEFAULT_SIDEBAR_VISIBLE_FOR_AUTHORISED_USER =
+		'VectorDefaultSidebarVisibleForAuthorisedUser';
+
+	/**
+	 * @var string
+	 */
+	public const CONFIG_KEY_DEFAULT_SIDEBAR_VISIBLE_FOR_ANONYMOUS_USER =
+		'VectorDefaultSidebarVisibleForAnonymousUser';
+
 	/**
 	 * @var string
 	 */
diff --git a/includes/VectorTemplate.php b/includes/VectorTemplate.php
index f535309..ff1190c 100644
--- a/includes/VectorTemplate.php
+++ b/includes/VectorTemplate.php
@@ -22,6 +22,8 @@
  * @ingroup Skins
  */
 
+use Vector\Constants;
+
 /**
  * QuickTemplate subclass for Vector
  * @ingroup Skins
@@ -170,7 +172,7 @@ class VectorTemplate extends BaseTemplate {
 
 			'data-sidebar' => $this->buildSidebar(),
 			// [todo] fetch user preference when logged in (T246427).
-			'sidebar-visible' => true,
+			'sidebar-visible' => $this->isSidebarVisible(),
 			'msg-vector-action-toggle-sidebar' => $this->msg( 'vector-action-toggle-sidebar' )->text(),
 		] + $this->getMenuProps();
 
@@ -259,6 +261,23 @@ class VectorTemplate extends BaseTemplate {
 		return $data;
 	}
 
+	/**
+	 * Determines wheather the initial state of sidebar is visible on not
+	 *
+	 * @return bool
+	 */
+	private function isSidebarVisible() {
+		$skin = $this->getSkin();
+		if ( $skin->getUser()->isLoggedIn() ) {
+			return $this->getConfig()->get(
+				Constants::CONFIG_KEY_DEFAULT_SIDEBAR_VISIBLE_FOR_AUTHORISED_USER
+			);
+		}
+		return $this->getConfig()->get(
+			Constants::CONFIG_KEY_DEFAULT_SIDEBAR_VISIBLE_FOR_ANONYMOUS_USER
+		);
+	}
+
 	/**
 	 * Render a series of portals
 	 *
diff --git a/skin.json b/skin.json
index 6ee79b6..b6c4f2a 100644
--- a/skin.json
+++ b/skin.json
@@ -153,6 +153,12 @@
 		"VectorDefaultSkinVersionForNewAccounts": {
 			"value": "1",
 			"description": "@var string:['2'|'1'] The version ('2' for latest, '1' for legacy) of the Vector skin to **set** for newly created user accounts. **The value is persisted as a user preference.** This configuration is not used for preexisting accounts (see VectorDefaultSkinVersionForExistingAccounts) and only ever executed once at new account creation time."
+		},
+		"VectorDefaultSidebarVisibleForAuthorisedUser": {
+			"value": true
+		},
+		"VectorDefaultSidebarVisibleForAnonymousUser": {
+			"value": false
 		}
 	},
 	"ServiceWiringFiles": [