Yes, this is a new update that we're experimenting for limited users as of now. Let us know your thoughts by sending feedback with these steps: https://goo.gl/c3WzSs
@TeamYouTube I just noticed this bigger video screen on portrait view for the mobile app. Is this a glitch or an update? It’s great
pic.twitter.com/Z1hKf4xCeK
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I like anime and peace and quiet