Atom Regular Expressions

I have to give a presentation about RegEx very soon and I would love to have Atom look like this

Can somebody please explain me how I can make the search bar much bigger like in the picture so that people can see easier what I’m typing during my live demo?
And also how I can make RegEx syntax highlighting in search bar?

I havent really used Atom so far so I’m fairly new to changing things in Atom.
This picture is a screenshot of this video