Hey does anyone know what IDE/environment Amazon uses for LLD rounds?

My case is a bit curios because I have been asked to come offline with my system (if I wish to do so) and they want me to write code live on my laptop and later share it with them.

Now I am practising with IntelliJ, but I’d like to know what Amazon uses generally in online interviews for LLD so I can get more proficient/used to that.

Also how often did the interviewer ask you to draw a UML diagram? Should I focus on that?

Thanks in advance.