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First, I use
\feynmandiagram[horizontal=a to b]
and I found that the diagram is too small then I change to
\feynmandiagram[large, horizontal=a to b]
However, nothing is changed. I also try the code in the manual which compare 3 size (small, medium, and large) but I also get the same size for 3 diagrams.
Am I miss something?
Thanks.
The style keys small and large only change the default separation between vertices, but they do not rescale the overall diagram, and this should work in all compilers. (Note: At the moment it does not, it only works with lualatex, see https://github.com/JP-Ellis/tikz-feynman/issues/35#issuecomment-258429193. So either use lualatex, or the suggestion at the bottom of this post.)
As a result, if the position of vertices is specified explicitly,
\vertex (a) at (0, 1);
or if you specify the separation explicitly,
\vertex [right=1cm of b] (a);
then the small and large keys will have no effect on the placement of these. Since you haven't provided the actual diagram you are drawing, then I'm only speculating that this is the reason.
If an overall scaling is really desired, it is possible to do so with the appropriate TikZ key, which can be passed to \feynmandiagram. In particular, use:
\feynmandiagram[scale=2,transform shape][horizontal=a to b]
where the first set of brackets are the TikZ specific options, and the second set are the TikZ-Feynman options. you can change the 2 to an appropriate value.
large and small only modify the default distances between nodes. If, for example, the position of the vertices is specified manually, then these keys will have no effect. With your permission @TorbjørnT., I would like to amend your answer to reflect that.