diff --git a/resources/skins.citizen.preferences/clientPreferences.js b/resources/skins.citizen.preferences/clientPreferences.js
index f55c3bd0..82d07197 100644
--- a/resources/skins.citizen.preferences/clientPreferences.js
+++ b/resources/skins.citizen.preferences/clientPreferences.js
@@ -83,6 +83,9 @@ function toggleDocClassAndSave( featureName, value, config ) {
 	const pref = config[ featureName ];
 	const callback = pref.callback || ( () => {} );
 	clientPrefs.set( featureName, value );
+	// Client preferences often change the layout of the page significantly, so emit
+	// a window resize event for other apps that need to update (T374092).
+	window.dispatchEvent( new Event( 'resize' ) );
 	callback();
 }