Eu acho que você está procurando
:set formatoptions-=cro
Em :help fo-table
:
You can use the 'formatoptions' option to influence how Vim formats text.
'formatoptions' is a string that can contain any of the letters below. The
default setting is "tcq". You can separate the option letters with commas for
readability.
letter meaning when present in 'formatoptions'
t Auto-wrap text using textwidth
c Auto-wrap comments using textwidth, inserting the current comment
leader automatically.
r Automatically insert the current comment leader after hitting
<Enter> in Insert mode.
o Automatically insert the current comment leader after hitting 'o' or
'O' in Normal mode.
...