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-Andrew
theres a bug on the Wine macOS version of Classicube where it doesn't fullscreen. to fix it:
video on how to do it https://streamable.com/ovo3n
If you run classicube using the mono framework, you should be able to fullscreen it on mac without issue.
I just tested it now on OSX 10.12.6
Not a bug with the classicube client itself, Wine is just absolutely dreadful for anything.
As per Umby's suggestion, I'd advise running Mono instead.