Fix ellipsis.

packages/launcher/style/index.css

@@ -169,6 +169,8 @@
   font-size: var(--jp-ui-font-size1);
   color: var(--jp-ui-font-color1);
   box-sizing: border-box;
+  overflow: hidden;
+  white-space: nowrap;
   text-overflow: ellipsis;
   text-align: center;
 }