Read where the style was changed
Netflix’s appearance help says changes made through its Android app apply only to titles played on that Android mobile device. If another screen still uses a different style, that observation does not by itself establish that the setting failed to save. First identify which route was used to change the appearance. Netflix’s Android route uses My Netflix, Manage Profiles and Subtitle Appearance.
Keep style and track separate
A larger font or darker background concerns how an available subtitle track is drawn. It does not select a different language, add SDH cues or make a missing translation appear. Record both the appearance and the selected track when comparing screens so a caption-availability issue is not mistaken for a style-sync issue.
Use the correct platform instructions
Netflix separately documents browser profile appearance controls and directs Apple-device users to Apple’s relevant settings. Follow the current branch for the actual viewing device. Do not repeatedly reinstall a television app just because a phone-specific appearance change did not propagate to it.
Verify the intended reading task
Return to the same captioned passage and check whether the Android style improves readability without obscuring needed content. If another device needs a different arrangement, inspect its supported route separately. Report the device, appearance-setting route and actual result; a single saved preference is not evidence that every Netflix client exposes an identical caption renderer.
Questions, answered
Do Android app appearance changes apply universally across every device?
Netflix explicitly limits those changes to that Android mobile device.
Does a style change supply a missing caption track?
No. Appearance and track availability are separate.