Check the actual title’s audio choices
Start the selected work, pause and use the Roku remote’s options control as described by HIDIVE. Inspect Audio Track for the item. The help qualifies the choice by whether multiple tracks are available, so do not assume every episode has every dub.
For a comparison, keep the same episode and note the audio language selected. A different series with a different dub history is not a clean way to establish whether the setting on the original item changed.
Understand the subtitle limitation before repeating changes
The current Roku help specifies English subtitles regardless of the audio selection. Choosing Japanese audio should therefore not be treated as an instruction to produce Japanese subtitle text. The two language fields describe different elements of the presentation.
If the viewing goal is language learning with matching spoken and written Japanese, this particular documented subtitle condition may not meet that need. Identify another authorised presentation that explicitly offers the required combination rather than continually changing the soundtrack.
Separate translation, captions and interface text
A subtitle translation, captions describing non-speech sounds and the application’s menu language are different features. A menu changing language does not demonstrate that a new subtitle track has been supplied for the video.
Before asking support, describe the needed output precisely. For example, say that the desired result is Japanese speech with a particular written-language track, rather than only requesting Japanese mode. This gives the publisher a clear feature or availability question.
Record a focused device-specific issue
If the player behaves differently from the documented route, retain the Roku model, software, app version and exact episode. Note whether the menu is missing, a track is absent or selecting a visible track does not change audio.
This article uses the current official Roku guidance and does not claim a physical-device test or that every other HIDIVE platform has the same controls. It also does not establish access through an IPTV Australia plan.
Questions about this guide
Does choosing Japanese audio also select Japanese subtitles on Roku?
The reviewed HIDIVE help says subtitles remain English regardless of audio.
Does every episode have multiple audio tracks?
The help makes track selection conditional on the tracks actually supplied.