diff --git a/src/vs/workbench/contrib/testing/browser/media/testing.css b/src/vs/workbench/contrib/testing/browser/media/testing.css
index 7f42e463ff6c..d93803367a42 100644
--- a/src/vs/workbench/contrib/testing/browser/media/testing.css
+++ b/src/vs/workbench/contrib/testing/browser/media/testing.css
@@ -19,10 +19,11 @@
 .test-output-peek-tree .test-peek-item .name {
 	display: flex;
 	align-items: center;
-}
-
-.test-explorer .test-item .label {
-	white-space: pre-wrap;
+	flex-grow: 1;
+	gap: 0.15em;
+	width: 0;
+	overflow: hidden;
+	white-space: nowrap;
 }
 
 .test-explorer .test-item,