How to turn on the feature of graying out unimportant words?

Dear friends,

I am learning Spanish with LLN and find it most helpful to me. I read in the Help section there is a feature of graying out infrequently used words in the captions so we can focus on the more important words.

How do I turn it on?

Thanks and best regards,

Hi. Actually this feature was removed from the extension for a long time, but we just added it back yesterday. Take a look in the settings now. There is an issue when using with Korean, I will fix this soon.