if you want to just turn it off, you can give
:nunmap <buffer> <CR>
since this is a local buffer mapping.
or
:h vimwiki_<cr>
you have found:
<CR> Follow/create wiki link (create target wiki page if needed). Maps to |:VimwikiFollowLink|. To remap: > :nmap <Leader>wf <Plug>VimwikiFollowLink
if you reassign it to another key, for example. the keys in the example <leader>wf , <cr> will reset to normal.
because in its code vmwiki has:
if !hasmapto('<Plug>VimwikiFollowLink') nmap <silent><buffer> <CR> <Plug>VimwikiFollowLink endif
same for <BS>
Kent
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