Multi Editing Frame Properties

I need to setting up a duraction on 50% frames to 20ms, but, when I select needed frames and set 20ms, but I edited only one frame, can you fix it?

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Have you tried selecting several frames and pressing the P key? This should work on v1.2.6:

No, I do it by right click. But in window option frame number writed me all of my selects frames but redacting only one, maybe it bug.
(Google Translate, sorry if text has mistakes)