same here, but use nnoremap <Space> za vnoremap <Space> za also, for folding in general I'd recommend using set foldmethod=marker which has the b

same here, but use nnoremap <Space> za vnoremap <Space> za also, for folding in general I'd recommend using set foldmethod=marker which has the benefit of making folds more 'transparent' in your code, and also persistent across vim sessions