When everything is highlighted, nothing is highlighted.
The current karaoke mode (on Android) is close to useless with long sentences/paragraphs (see image #2 below) because the highlighted area is the full paragraph and it can fill the whole screen, when not more.
The video #1 below is of a podcast I listen to with the Snipd podcast reader app. This is real karaoke mode. It’s not always word-level accurate, but it’s close enough to be useful and comfortable.
#1 - with the Snipd podcast client:
URL : https://youtube.com/shorts/dhz1e0JznZc?si=sfdNiAz3lcW8Jcs6
#2 - The same podcast wih the LingQ karaoke mode:
