Within the remote control screen of the app clicking the icon that looks like a pair of headphones should toggle remote listening on and off.
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Mine togles to my iPhone but when I togle off, the tv speaker does not resume. I have to go to the home page then back to the channel I was watching before the tv volume returns. By the way, I am using a Philips, Roku compatible, sound bar.
@Burtorc2 the problem could be with either your sound bar or your iPhone.
I’m into videotapes and old electronics stuff, including extenders, converters and analog 4:3 TV sets (which are obsolete these days), and Miss Bianca is my favorite character in Disney’s The Rescuers (1977) and its sequel, The Rescuers Down Under (1990). I am not a Roku employee, only a user like you. ~ Jordan