@Jlobo, that screen is coming from your TV, so you need to use its remote to get rid of it. It seems like a lot of TVs have an Accessibility screen that appears if you hold the mute button down. All I can suggest is to barely tap the mute button when you want to use it to try to prevent it from happening.
Edit: Wait! This is on an actual Roku TV or a Roku device connected to a non-Roku TV?
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