diff --git a/hosts/adventurer.toml b/hosts/adventurer.toml
index c357492..d42a805 100644
--- a/hosts/adventurer.toml
+++ b/hosts/adventurer.toml
@@ -29,3 +29,7 @@ background_path = "~/.local/share/backgrounds/adventurer/t.jpg"
 match = "Pioneer Electronic Corporation AV Receiver Unknown"
 mode = "3840x2160@60Hz"
 scale = 2
+
+[niri]
+# 1/3 proportion is better for the ultrawide
+default_column_width = 0.33333
diff --git a/install.py b/install.py
index 067841e..ccd3f66 100755
--- a/install.py
+++ b/install.py
@@ -145,6 +145,11 @@ class OutputConfig:
         }
 
 
+@define
+class NiriConfig:
+    default_column_width: float = 0.5
+
+
 @define
 class HostConfig:
     name: str
@@ -164,6 +169,7 @@ class HostConfig:
     use_jump_host: bool = False
     inputs: list[InputConfig] = field(factory=list)
     outputs: list[OutputConfig] = field(factory=list)
+    niri: NiriConfig = field(factory=NiriConfig)
 
     @property
     def swaylock_images(self) -> str:
diff --git a/templates/.config/niri/config.kdl b/templates/.config/niri/config.kdl
index 3a44faa..c924d2a 100644
--- a/templates/.config/niri/config.kdl
+++ b/templates/.config/niri/config.kdl
@@ -100,7 +100,7 @@ layout {
     // preset-window-heights { }
 
     // You can change the default width of the new windows.
-    default-column-width { proportion 0.5; }
+    default-column-width { proportion ${host.niri.default_column_width}; }
     // If you leave the brackets empty, the windows themselves will decide their initial width.
     // default-column-width {}