diff --git a/src/modules/config.js b/src/modules/config.js
index 3d3ce1f83771919bc898b2aef5abd70c0eb92093..0f59675056527c3edb909578cd35bf307b4408b4 100644
--- a/src/modules/config.js
+++ b/src/modules/config.js
@@ -54,7 +54,7 @@ export const defaultState = {
   interfaceLanguage: browserLocale,
   hideScopeNotice: false,
   useStreamingApi: false,
-  sidebarRight: false,
+  sidebarRight: undefined, // instance default
   scopeCopy: undefined, // instance default
   subjectLineBehavior: undefined, // instance default
   alwaysShowSubjectInput: undefined, // instance default