diff --git a/src/core/public/chrome/ui/header/header.scss b/src/core/public/chrome/ui/header/header.scss
index 8828679e7284..f8da8a809d70 100644
--- a/src/core/public/chrome/ui/header/header.scss
+++ b/src/core/public/chrome/ui/header/header.scss
@@ -49,6 +49,10 @@
   & > .euiHeaderSection {
     gap: $euiSizeS;
 
+    &:only-child {
+      width: 100%;
+    }
+
     // stylelint-disable-next-line @osd/stylelint/no_modifying_global_selectors
     & > .euiHeaderSectionItem:empty {
       display: none;