That depends on the language — whereas German puts spaces around —, English afaik usually doesn’t.
Similarly, French puts spaces before and after ? ! while English and German only put spaces afterwards.
[EDIT: I originally wrote that French treats . , ! ? specially. In reality, french only treats ? and ! specially.]
In English, typically em-dashes are set without spaces or with thin spaces when used to separate appositives/parentheticals (though that style isn't universal even in professional print, there are places that aet them open, and en-dashes set open can also be used in this role); when representating an interruption, they generally have no space before but frequently have space following. And other uses have other patterns.
> whereas in English it’s em-dashes without spaces
Didn't know! Woot, I win!
Why does AI have a preference for doing it differently?
french does "," and "." like the british and germans the rest is space befor space after
In German you use en-dashes with spaces, whereas in English it’s em-dashes without spaces. Some people dislike em-dashes in English though and use en-dashes with spaces as well.