difficulty level filtering

Hello, I find the site very useful, thank you for the site. I think it is better to filter the difficulty levels like a1-a2-b1-b-2-c1-c2. For example, when we select beginner, both a1 and a2 texts appear. Also, it would be better if the number of words can be filtered and the number can be entered manually. .

I agree this bar was available before, as it appears in the tutorial, but now it’s missing. I suggest returning this difficulty bar, as it’s vital for any graded reader app.