diff --git a/modules/rosenthal/examples/niri.kdl b/modules/rosenthal/examples/niri.kdl
index 4750395..30cd2c0 100644
--- a/modules/rosenthal/examples/niri.kdl
+++ b/modules/rosenthal/examples/niri.kdl
@@ -639,14 +639,13 @@ debug {
   honor-xdg-activation-with-invalid-serial
 }
 
-// Needed for Emacs in the installer.
+// Emacs has a window height > 100% whening using CSD.
 prefer-no-csd
 
-// Needed for WezTerm in the installer.
+// Keep WezTerm maximized so that the installer won't be resized.
 window-rule {
     match app-id="org.wezfurlong.wezterm"
-    default-column-width { proportion 0.5; }
-    default-window-height { proportion 1.0; }
+    open-maximized true
 }
 
 // Background color to match the wallpaper.
diff --git a/modules/rosenthal/examples/wezterm.lua b/modules/rosenthal/examples/wezterm.lua
new file mode 100644
index 0000000..e66cb05
--- /dev/null
+++ b/modules/rosenthal/examples/wezterm.lua
@@ -0,0 +1,12 @@
+-- Keep WezTerm maximized so that the installer won't be resized.
+-- https://wezterm.org/config/lua/gui-events/gui-startup.html
+local wezterm = require 'wezterm'
+local mux = wezterm.mux
+local config = {}
+
+wezterm.on('gui-startup', function(cmd)
+  local tab, pane, window = mux.spawn_window(cmd or {})
+  window:gui_window():maximize()
+end)
+
+return config
diff --git a/modules/rosenthal/services/desktop.scm b/modules/rosenthal/services/desktop.scm
index ce63d2b..fbfcefb 100644
--- a/modules/rosenthal/services/desktop.scm
+++ b/modules/rosenthal/services/desktop.scm
@@ -679,6 +679,8 @@ set-keymap us dvorak -o ctrl:nocaps\n")
      ,(local-file "../examples/noctalia-shell/shell-state.json"))
     (".config/noctalia/settings.json"
      ,(local-file "../examples/noctalia-shell/settings.json"))
+    (".config/wezterm/wezterm.lua"
+     ,(local-file "../examples/wezterm.lua"))
     (".config/xfce4/helpers.rc"
      ,(plain-file "helpers.rc" "TerminalEmulator=open-wezterm-here\n"))