Documentation/config/checkout.txt

   1 checkout.defaultRemote::
   2         When you run 'git checkout <something>'
   3         or 'git switch <something>' and only have one
   4         remote, it may implicitly fall back on checking out and
   5         tracking e.g. 'origin/<something>'. This stops working as soon
   6         as you have more than one remote with a '<something>'
   7         reference. This setting allows for setting the name of a
   8         preferred remote that should always win when it comes to
   9         disambiguation. The typical use-case is to set this to
  10         `origin`.
  11 +
  12 Currently this is used by linkgit:git-switch[1] and
  13 linkgit:git-checkout[1] when 'git checkout <something>'
  14 or 'git switch <something>'
  15 will checkout the '<something>' branch on another remote,
  16 and by linkgit:git-worktree[1] when 'git worktree add' refers to a
  17 remote branch. This setting might be used for other checkout-like
  18 commands or functionality in the future.