diff --git a/.config/niri/config.kdl b/.config/niri/config.kdl
index 60dc6adc..feedc8a3 100644
--- a/.config/niri/config.kdl
+++ b/.config/niri/config.kdl
@@ -195,9 +195,13 @@ window-rule {
 
     }
 }
+window-rule {
+    match app-id="thunderbird$"
+    default-column-width { proportion 0.75; }
+}
 window-rule {
     match app-id="vesktop$"
-    // clip-to-geometry true
+ // clip-to-geometry true
     // min-width 500
  // draw-border-with-background true
 }