Daniel,
1. Thanks. My Safari on Mac browser doesn¡¯t seem to display those
interface elements, at least not that
I can see, or hunt and find. What browser are you
using? 2 Attachments.
It isn't a matter of browser. It is
a question of where you are looking.
In the screen shots you are looking at the list of Topics. You
can't delete individual messages from there. Switch to Messages
view:

Or, open a message:

I
infer Topics can be set in web-based message, and a ¡°Topic¡± is
defined by its # Hashtag.
To paraphrase what Duane said, Hashtags apply to Topics, but a
given topic may have zero, one or more hashtags in their Subject.
More importantly, many topics may have the same hashtag. That's in
fact a key to the utility of hashtags, they let you mark a bunch
of Topics as having something in common. The "something" that
unites them is for you to decide. As a moderator, you can edit the
hashtag to give it a Description that will help members understand
what it is these topics have in common.
For example, the beta group has very strict hashtag usage,
including #bug for topics reporting a bug or problem with
Groups.io and #suggestion for topics making a suggestion to
improve Groups.io.
Shal
FWIW: Firefox 82.0.3 (64-bit) on Win10 Pro version 2004.
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