diff --git a/packages/edit-site/src/components/layout/style.scss b/packages/edit-site/src/components/layout/style.scss
index 2fe210327661d..e5661c61eb789 100644
--- a/packages/edit-site/src/components/layout/style.scss
+++ b/packages/edit-site/src/components/layout/style.scss
@@ -61,6 +61,7 @@
 .edit-site-layout__sidebar {
 	z-index: z-index(".edit-site-layout__sidebar");
 	width: 100vw;
+	flex-shrink: 0;
 
 	@include break-medium {
 		width: $nav-sidebar-width;