YOU SHALL NOT RESIZE!?!?!

[The chaser]

Anyways, I wouldn't use a small screen for mapping. Mapping requires a good resolution in order to get everything well (if we don't work well, the product isn't good).

So, I think that what you really need is a new screen.
Although, if you really want to do it in your macbook, go to the level editor<Edit<Options and there will be the resolution. I've read that there's a .cfg for those settings somewhere, although it was for windows, so I'm not really sure how it's stored in mac.

Also, why is this in Off-Topic?