diff --git a/niri/screens/lab320.kdl b/niri/screens/lab320.kdl
index 9b9ee7d..ae37dde 100644
--- a/niri/screens/lab320.kdl
+++ b/niri/screens/lab320.kdl
@@ -5,7 +5,7 @@ output "HP Inc. HP E24 G4 CN432306YR" { // HEI-Samsung
     position x=-1920 y=-450
 }
 
-output "HP Inc. HP E24 G4 CN43240DK9" { // HEI-Dell
+output "HP Inc. HP E24 G4 CN43240DK9" {
     // mode "1920x1080"
     scale 1
     transform "90"
@@ -25,6 +25,21 @@ output "HP Inc. HP E24 G4 CN43240DK9" { // HEI-Dell
     }
 }
 
+output "Dell Inc. DELL P3425WE 1KV1Z54" { // Dell side teacher place
+    position x=-760 y=-1440 // Up
+    // position x=-3440 y=-720 // Side
+    layout {
+        always-center-single-column false
+        preset-column-widths {
+            proportion 0.33333
+            proportion 0.5
+            proportion 0.66667
+            proportion 0.99
+        }
+        default-column-width { proportion 0.66667; }
+    }
+}
+
 output "Dell Inc. DELL P2419H B9JSPF3" {
     // mode "1920x1080"
     scale 1