diff --git a/kcmkwin/kwindesktop/package/contents/ui/main.qml b/kcmkwin/kwindesktop/package/contents/ui/main.qml
--- a/kcmkwin/kwindesktop/package/contents/ui/main.qml
+++ b/kcmkwin/kwindesktop/package/contents/ui/main.qml
@@ -126,6 +126,7 @@
 
                 from: 1
                 to: 20
+                editable: true
 
                 onValueModified: kcm.desktopsModel.rows = value
             }