Cannot turn off closed caption

Edit (updated):

Unfortunately, I didn't see your original post bmhoward3 in which you stated that you did use a Roku APP version 1.0.73 until after I replied to this post; perhaps in the future, LDF can reply on the same thread to avoid confusion. So I have deleted my original reply post. I didn't realize that Sony TV's were able to download Roku channel apps after seeing that streamable article. Now I'm wondering if this article is more recent than your TV's, meaning Sony may no longer support the Roku channel on its TVs, but I don't know how old your TV is or how old that article is.

I also didn't realize your original post was almost a year old. 

If your app hasn't been fixed or updated and is still on version 1.0.73 after this amount of time -- this is the potential problem with smart TVs (especially older smart TVs) in which the channel apps on them can stop being maintained as they slowly become outdated with no newer updates to fix issues, and after a while, the channel app may stop working.

This closed caption issue may have been the first sign that this app is no longer being maintained on your smart TV as 1.0.73 may have been the final update. This is what happened to my old smart TV which just lost app functionality over time. I fixed my app issues by purchasing a Roku device that I plug into my TV, and all of my channels continue to stay up to date, and if there are issues then they are usually resolved quickly.

Even if the streaming device goes out of date (which has yet to happen to my Roku 3 which I've had for over a decade and it still updates just fine, while my older Roku 1 is now a brick) then it's still cheaper to purchase a newer streaming device than a brand new smart TV when a company may decide to stop updating it to goad the consumer into purchasing a newer model. 

If you don't want to purchase a streaming device because it's just this channel giving you issues and the rest of your channels update fine, then as I said in my original post, you can use a computer or a smart device such as a tablet to cast the Roku channel to your TV if you don't want to see the closed captions. But after a year and no replies means that this issue probably won't be fixed, unfortunately, and over time you may end up losing the ability to use this app on your smart TV. You either have to use workarounds or purchase a streaming device that you can connect to your TV like I had to do.