How to delete or remove this vertical Line?

Thunderbird
#1

Hi all, Please help to delete or remove this vertical line(Blue,Red…) when I open email contents and reply. I had add “ReFwdFormatter”, but it did not happen. Thank you all. please give me this favor if you know it. thanks.

截屏2020-01-1115.00.52
截屏2020-01-1115.00.52394×848 23.1 KB

#2

Use the beta version of ReplyWithHeader.
https://support.mozilla.org/en-US/questions/1276885

#3

Thanks for your help.