--- a/ui/gtk/window.c	Mon Sep 07 18:55:59 2026 +0200
+++ b/ui/gtk/window.c	Tue Sep 08 16:08:59 2026 +0200
@@ -1115,3 +1115,11 @@
     
     return obj;
 }
+
+void ui_window_fullscreen(UiObject *obj, UiBool fullscreen) {
+    if(fullscreen) {
+        gtk_window_fullscreen(GTK_WINDOW(obj->widget));
+    } else {
+        gtk_window_unfullscreen(GTK_WINDOW(obj->widget));
+    }
+}