The contents of references buffers is controlled using the hook
magit-refs-sections-hook. See Section Hooks to learn about such hooks and how to customize them. All of the below functions are members of the default value. Note that it makes much less sense to customize this hook than it does for the respective hook used for the status buffer.
user option magit-refs-sections-hook
Hook run to insert sections into a references buffer.
Insert sections showing all local branches.
Insert sections showing all remote-tracking branches.
Insert sections showing all tags.