Do you mean recursing into a directory and summing the file sizes of its contents? exa doesn't do this, sorry, but it's something I've been thinking of adding.
ls actually displays the 'file size' of the directory, which I've left out, as that number has never benefitted me, ever.
ls actually displays the 'file size' of the directory, which I've left out, as that number has never benefitted me, ever.