diff --git a/ui/suite/css/desktop.css b/ui/suite/css/desktop.css
index 1b4a722..18c841f 100644
--- a/ui/suite/css/desktop.css
+++ b/ui/suite/css/desktop.css
@@ -271,6 +271,8 @@ body.window-maximized .bg-svg {
 body.window-maximized .window-element {
     z-index: 9998 !important; /* Lower than minibar's 9999 */
     top: 0 !important; /* No minibar offset - start at top */
+    height: 100vh !important; /* Fill entire screen height */
+    width: 100vw !important; /* Fill entire screen width */
 }
 
 /* Ensure window body is opaque */