Closed Captioning not displaying

I watch Apple TV through my Roku on my Sony TV. Both TV and Roku general settings have closed captioning display always on and works fine in all my other streaming apps.

However, when watching programs on or subscribed to through Apple TV, app, closed captioning VERY rarely displays. I have seen older responses to this issue and advise that when I access the Subtitles Icon above the play status line, it 99% only shows two options: Off or Auto.

This situation occurs when the default language of the film its in English. I have seen several programs that are not filmed in English, in which case I can understand that closed captioning in English (CC) is not available -- I'm only concerned with English (CC) subtitles displaying.

I have Auto selected but it doesn't seem to have any functionality. Only once it did display Off, English (CC) and other multiple options.

By selecting the English (CC) option, the closed captioning actually worked. However, the closed captioning display was very large display and I could not find how it change the display size and font.

I'm really enjoying the Apple TV streaming service but I NEED a used the closed captioning function as my hearing is not the best.

Please advise how to make the closed captioning display properly or have the English (CC) option be available for selecting other than Auto option as it doesn't seem to cause any alternate display or sound effects.

Thank you.