The default editing experience when typing out a list of enums isn’t great.

The default editor definition:

gets you this:

Notice that the completion menu does not have entries for individual enums, although you can in fact type them in.

But add the grammar.wrap cell from grammar cells:

and you get this:

Now you get both the completion menu entries and the ability to type in the values directly.

Resources

Learn more about grammar.wrap and other grammar cells:

• The original paper describing various kinds of grammar cells and their semantics.
• Grammar cookies – a series of video tutorials by Kolja Dummann.