moderated Re: mute topic option
That's how it should work, though it's been ages since I last activated a Mute this Topic link in an e-mail message. If you are not logged in on the Groups.io website, you will be prompted to enter your login ID (the e-mail address with which you've subscribed) and password, as topic muting is something managed under your account level settings, but everything is already "filled in" as far as the actual information to mute a specific topic. If you have never established a password for your Groups.io account, then see: Establishing a Groups.io Website Account Password If You’ve Been an E-Mail Only User
What Sandra describes sounds like focus has somehow jumped back to the Reply to Sender link rather than remaining on the Mute this topic link.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
One does not discover new lands without consenting to lose sight of the shore for a very long time.
~ André Gide