eudc-inline-query-format

eudc-inline-query-format is a variable defined in `eudc-vars.el'.
Its value is

((name) (firstname name))

Documentation:
Format of an inline expansion query.
This is a list of FORMATs. A FORMAT is itself a list of one or more
EUDC attribute names. A FORMAT applies if it contains as many attributes as
there are individual words in the inline query string.
If several FORMATs apply then they are tried in order until a match
is found.
If nil, all the words are mapped onto the default server or protocol
attribute name.

The attribute names in FORMATs are not restricted to EUDC attribute names
but can also be protocol/server specific names. In this case, this variable
must be set in a protocol/server-local fashion, see `eudc-server-set' and
`eudc-protocol-set'.

You can customize this variable.