Change the UI style of ReadyAPi 4.0?

I just updated to 4.0, and the UI is horrendous. There's a lot of dead space. Is there a way to switch back to the previous UI without switching Ready API versions?

UI from 3.66

UI from 4.0

I already tried moving the bar down, but that's it doesn't go lower than that, so I'm stuck with that size, and I making my work slower since I have to scroll more than before