Thanks for the suggestion, please refer to the post quoted below to see my explanation of the spell check feature.
As for how to adjust the height of the floating window, you can refer to the FAQ section in the top post.
The search group of the main lookup window and the floating window are separate, I suggest you let all the dictionaries of the floating window expand automatically in this case. When all the dictionaries are expanded, the performance is the same when displaying 3 dictionaries and 300 dictionaries because the rendering engine works on demand.