Is there any way to block other devices from casting to my Fire TV Stick? Or hiding it from other devices? I tried separating the networks using a Powerline Wireless Extender, but devices on the other (Main) network can still cast to my Fire Stick.
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Does your modem/router have two Wi-Fi bands (2.4 GHz & 5 GHz)?
If so, keeping your Fire TV Stick connected to one, and your casting devices on another, should prevent them from seeing the Fire TV Stick as a casting option.
Other than that, there isn't an option to disable casting to your Fire TV Stick; however, feel free to submit your feedback via the following link: