Still nothing an year later?
My designs were very fine until yesterday! Now some sub-frames decide to revolt and start showing the display names?! Frankly, not all sub-frames show their names. Only a few. And indeed, this is quite annoying.
You can use a space in the Frame name as well 
Keeping the fervour alive!
A simple global setting to show/hide parent titles would be amazing!
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Yep please give us the option for to toggle these on and off. Particularly useful when building prototypes which need to have screens and notes on the canvas