I'm having basically the same issue. I have a galaxy s9 with spectrum mobile. After updating to android 10 I am having trouble screen mirroring to my roku tv (something I regularly did before). Now I see my wallpaper with a gear icon on the bottom left and an "all apps" button on the bottom right. I can seem to control it in anyway or show my screen on it. I am also looking for a solution to this.
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