Can't add items to layouts sensibly

Using the Qt Quick Controls 2 template, I'm trying to remove the TextField to add a Text item in its place. When I drop the Text in, it's positioned over the top of the Button.

If I drop the Text on the layout in the Navigator pane instead, it is positioned within the layout correctly, but there's no way to change the order using the "canvas"; I have to reorder the items in the navigator.