I'm using Movie Edit Pro Plus and I'm using a font for titles simulating the "Dymo" stickers. Unluckily, letters are not filled so you can see the video inside the letters and looks quite difficult to read.
I was trying to draw a white square under the text, so it will get letters in white and they will be completely readable. But I don't find any tool for doing basic drawings. Also, I don't know if there's a better way to get this.