Remove attachments in greyed out

The Remove Attachments is working for me on Big Sur 11.4 so long has you have highlighted an email that has an attachment.

if you really are on Big Sur 11.0 you need to upgrade immediately. There have been hundreds of critical fixes since 11.0.

mariards78 wrote:

I have a 2020 MacBook Air with BigSur V11.0 - the "remove attachments" option under messages is greyed out, how do I fix this?

You have to select the email you want to remove the attachment for it to light up

Command A is select all

Mail User Guide - Apple Support