How do you exit vimdiff mode in vim, specifically, for Fugitive?

Question

I am using vim with the fugitive extension. It has a :Gdiff command which brings you into vimdiff mode, but what is the right/quick way to close/quit vimdiff mode?

I.e.,

Answer 1

According to: https://github.com/tpope/vim-fugitive/issues/36

Close the other window. The easiest way to do this if you haven't shifted focus to it is , which means "make this Window the Only window."