Android · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Identify supplied captions first
Google’s Caption preferences controls format captions in supporting apps. They are separate from Live Caption, which generates speech transcription. Confirm that the programme actually has a usable caption track before changing its appearance. A style preference cannot create a subtitle language or sound-description track that the programme does not supply.
Open the documented preferences
Google documents Settings, Accessibility, Caption preferences, with Show captions and Caption size and style. Menus can differ with Android version and manufacturer software. Read the controls available on the device. Note the existing style so you can compare the result or restore it without guessing.
Choose a readable style
Select a suitable text size and text/background style in the available options. Judge contrast and fitting rather than choosing the largest size automatically. A caption line that is readable but covers an essential control may need another arrangement. Keep the programme’s normal caption menu available throughout the comparison.
Check whether the app supports the setting
Google explicitly warns that media apps which do not support Caption preferences may not follow them. Return to the same short captioned passage and inspect the result. If Android’s preview changes but the app’s text does not, record that boundary and inspect the app’s own documented caption controls.
Retain a useful configuration
Keep the system style that works across supporting apps and use a player-specific choice where its publisher provides one. Do not clear account data merely because a custom player ignores a system caption style. A support description should name the text source, app, Android version and setting that did or did not affect it.
Questions, answered
Does every media app honour Android Caption preferences?
No. Google states that support depends on the app.
Does styling generate missing captions?
No. Appearance and track availability are separate.