Hi! I just purchased the app today and am really enjoying the process so far. I've been trying to apply a more functional style of programming to my swift code and decided to give Haskell a go. :)
Anyway, I've got a weird issue with my playground results truncating even though theres plenty of space (iMac) - its not a huge deal but obviously it'd be nice to have all that space available for results. 
Thanks for purchasing the app and also for the report. I hope you will be pleased to hear that this issue is fixed in Version 1.1 of the app that will be released this coming Tuesday.
Please try your examples next week with the new version and, if there is still bad layout, please let us know!
BTW, did you know that Haskell for Mac is mostly written in Swift? We have got a conference talk (including a video) on how we apply functional programming principles in Swift for Haskell for Mac. A lot of that has been inspired by our Haskell work. If you are interested, check out https://speakerdeck.com/mchakravarty/functional-programming-in-a-stateful-world
Thats great! Right after I posted the issue I saw about the new version and wondered if it might be one of the updates.
Also thanks for that video link I will definitely watch the talk today!
Take care and good luck with the update release!
Version 1.1 of Haskell for Mac, which fixes this issue, has now been released.
Works great! Thanks. :)