I don't why such interface don't work for me. I don't like the JetBrains Mono as much in the interface but in the actual IDE it works nicely for me.

I really liked Consolas in the example but it's not free so there's that.

What I didn't get is why the syntax highlighting option is so limited. Java didn't work for me at all even though it's in the dropdwon.

I also didn't understand why the width of the code area so artificially limited.