That the audio guide you enabled probably from pressing the ioption * key 4 times. That's how you can turn it off as well by hitting the option * key 4 times. If you want to disable the shortcut go into settings:
settings> accessibility: scroll down to shortcut> disable
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.