First of all, check the below vim configuration which I’m using currently.

“ For smart keyboard
nnoremap <S-W>H <C-W>h
nnoremap <S-W>J <C-W>j
nnoremap <S-W>K <C-W>k
nnoremap <S-W>L <C-W>l
nnoremap <S-W>_ <C-W>_