Roku Device Features, Settings & Updates

Help configuring Roku device settings, using Roku OS features such as screen mirroring, adjusting display type and audio settings, using Guest Mode, and assistance with software updates.
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Level 7

RokuCast is broken

Roku cast no longer works with Smart View (Note 10+). All it does is open a channel that says "view recent history".
It worked perfectly last week and now this problem occurs on both my Roku TV in one room and on the Roku stick in another room. What on earth went wrong? I haven't done anything different from before.
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