Learn more on a passage

Select a passage and choose Learn more to get a deeper explanation of just that phrase. This is a drill: an annotation you asked for yourself, distinct from the passive Source, Define, and Expand marks the system adds on its own as you read.

Set how far the explanation goes with a depth control, Quick, Standard, or Deep, and steer what kind of annotation it is. Keep adjusting until the result fits what you needed.

A drilled annotation reads like any other mark once it settles: same underline, same popover, same place on the Marks page. What sets it apart is that you asked for it.