diff --git a/editions/dev/tiddlers/system/$__themes_tiddlywiki_vanilla_options_sidebarlayout.tid b/editions/dev/tiddlers/system/$__themes_tiddlywiki_vanilla_options_sidebarlayout.tid
new file mode 100644
index 000000000..2f4dcb4e0
--- /dev/null
+++ b/editions/dev/tiddlers/system/$__themes_tiddlywiki_vanilla_options_sidebarlayout.tid
@@ -0,0 +1,6 @@
+created: 20240311150859344
+modified: 20240311150859344
+title: $:/themes/tiddlywiki/vanilla/options/sidebarlayout
+type: text/vnd.tiddlywiki
+
+fluid-fixed
\ No newline at end of file