I use now tvOS 16.2 now. I also had this problem with Netflix for some time and Netflix or Apple support couldn't help me. The solution: Apple TV Settings->Accesibility->Subtitle and Captations->Style->Edit Styles-> Add a custom style where inside the Font section you should change the "Video Overrides Styles" to Off. Of course, in this new profile you should set the size to Large or Very Large and make sure you select this new custom profiule to be used.
Florin611
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