diff --git a/arduino-ide-extension/src/browser/style/settings-dialog.css b/arduino-ide-extension/src/browser/style/settings-dialog.css
index a3315454c..61e806ec0 100644
--- a/arduino-ide-extension/src/browser/style/settings-dialog.css
+++ b/arduino-ide-extension/src/browser/style/settings-dialog.css
@@ -89,6 +89,7 @@
 
 .additional-urls-dialog textarea {
     resize: none;
+    white-space: nowrap;
 }
 
 .p-Widget.dialogOverlay .dialogBlock .dialogContent.additional-urls-dialog {