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What are formal words for "can", for example "is able"?!
I think in this sentence, the first parts enables the user (or makes it possible for the user) to do something.
Best Answer
We have two issues here.
Grammar structure.
If you look at the original sentence you will notice that the subject is the user and the first part describes by what means the user does something:
The same is true for is able:
Once you change to enable, the whole first part becomes the subject, the comma is lost and the user is the object of the sentence (hint: the structure is always subject-verb-object, SVO)
Style.
Whether can or is able is the better choice is
a) a question of personal style and
b) context.
In my experience the "more complicated" or "formal" word can be better, but is not always neccesarily so. In this case, my gut feeling (I'm neither a linguist nor a native speaker) would be that can focuses on the fact of what the user does, enable points out the possibility to do something he previously couldn't. English is a language that (compared to other languages I know) gives less precedence1 to "specialized" words than others, so frankly, if can fits, I'd use it. Overuse of "formal words" can appear forced and even unnatural, but that is probably something for another SE site.
1 See? I'm falling into the "big words trap" myself..