Two naive questions

[Fergus Daly]

I've been reading/writing to this list since 2001 or maybe earlier and have only just Subscribe'd. Mainly because I have been aware when contributing to a thread I have always broken it by not using Follow-up properly, just artificially including the title prefix Re: in what is essentially a new post. Having Subscribe'd, I'm no clearer how to do this properly.
1. Please can somebody point me to an instruction?
2. Since when the new look provided by
https://cygwin.com/pipermail/cygwin/ ?
Is there a way to default to the "legacy" look provided at, say,
https://sourceware.org/legacy-ml/cygwin/2019-04/ 
but not obviously available today (even by changing 2019 to 2020 in the line above)?
(I've looked for what I had assumed would be a long conversation on this change, but cannot find anything.)
Thanks.