OMG! Panel with progress on a level is not open by default now!!!
Until some days ago, we can learn in duolingo and when we finished a lesson, we get back to the levels chart, but the popup with % progress was opened by default at the level we've just finished the previous questions, so we can keep going by using keyboard. Now we must click on the level to open the popup again and click "Practice" button. I don't know who decided to change the UI but is really annoying.