diff --git a/src/routes/api/options.ts b/src/routes/api/options.ts
index 60cfc9bb7..c7e48c432 100644
--- a/src/routes/api/options.ts
+++ b/src/routes/api/options.ts
@@ -82,6 +82,7 @@ const ALLOWED_OPTIONS = new Set<OptionNames>([
     "allowedHtmlTags",
     "redirectBareDomain",
     "showLoginInShareTheme",
+    "splitEditorOrientation",
 
     // AI/LLM integration options
     "aiEnabled",