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

Casting from Android - some apps list Roku devices, some don't

Casting from a Samsung Galaxy S9+ to a Roku Express. Clicking the cast icon produces different available devices depending on the app. From CNN for example, my three Roku devices are all listed along with a couple of Google devices; casting works well. When I try to cast from Facebook, I only am offered the Google devices, none of the Rokus appear in the list.