Hi,
Is it community-at-large? Or community at large. Hyphens or no? I know in the ENGLISH language it is hyphenated but not sure what the modern usage is in America.
No, don't use hyphens. It's not an adjectival phrase, unless you want to say something odd like This is a community-at-large issue. Just say something like This issue involves the community at large, where 'community' is a noun/object and 'at large' describes it.
I would expect this to be the usage in both BrE and AmE.
Best wishes, Clive