fatal: no such path 'A' in HEAD using fugitive plugin

Question

I've my little vim distro with tpope/vim-fugitive installed. Using Git blame in little project (little means with few folders) works fine. Used with files with a deep tree of folders give me a bad result: the blame part is so huge that the editor part contains just few columns. I can fix this with Ctrl-w 20>. Is there a way to configure fugitive without file name and just committer name?

Reading documentation I saw the following stuffs (I removed some parts not very interesting for this question).

                                                *:Git_blame*
:Git blame [flags]      Run git-blame [flags] on the current file and open the
                        results in a scroll-bound vertical split.  The
                        following maps, which work on the cursor line commit
                        where sensible, are provided:

                        A     resize to end of author column

I suppose the command I am looking for is :Git blame A.

Running the previous command vim responds with the following message:

fatal: no such path 'A' in HEAD

So, ...

Answer 1

You must press A in the blame info window. It is not a command argument.

The preceding text is relevant:

The following maps, which work on the cursor line commit where sensible, are provided: