diff --git a/core/modules/navigation/css/base/layout-builder.css b/core/modules/navigation/css/base/layout-builder.css
index f345c22fe9ad3ff0e9ccb98e14c1a4cc094f488e..9d79be57072d173c9bfbc767809678d411b388b6 100644
--- a/core/modules/navigation/css/base/layout-builder.css
+++ b/core/modules/navigation/css/base/layout-builder.css
@@ -12,3 +12,10 @@
 #navigation-layout .layout-builder {
   border: none;
 }
+
+/* Label when "content preview" is disabled. */
+
+.navigation-layout .layout-builder-block__content-preview-placeholder-label {
+  font-size: 0.79rem;
+  overflow-wrap: anywhere;
+}
diff --git a/core/modules/navigation/css/base/layout-builder.pcss.css b/core/modules/navigation/css/base/layout-builder.pcss.css
index bed6fede0f78090079ee5e993614b6d91758465d..4cd61aca79ea09c4b24ec5bd268e054a6dc55f8a 100644
--- a/core/modules/navigation/css/base/layout-builder.pcss.css
+++ b/core/modules/navigation/css/base/layout-builder.pcss.css
@@ -5,3 +5,9 @@
 #navigation-layout .layout-builder {
   border: none;
 }
+
+/* Label when "content preview" is disabled. */
+.navigation-layout .layout-builder-block__content-preview-placeholder-label {
+  font-size: 0.79rem;
+  overflow-wrap: anywhere;
+}