I read in other tickets, for example #2992, that
you switched to using SF symbols from Apple for icons in MM. This
is fine. There is, however, strong visual discrepancy between
mailbox icons in the left column, the mailbox list, which are
fine-lined in gray tones and have no fills, whereas the status
icons and flags in the mailbox lists are bigger in relation and
solid filled, which makes them appear even bigger. I am talking
about symbols indicating that mail message is unread, replied to,
forwarded, has flag, etc.
This was raised in the mailing list last August (I was many
versions of MM behind until recently), but I see no ticket related
to this.
Apple documentation
https://developer.apple.com/design/human-interface-guidelines/found...
states that you can adjust the display of those icons. Maybe
instead of Monochrome you could use the Hierarchical rendering mode
with smaller weight and scale for the status icons. The size in
version like 5657 was about right.
It would also be great if you let us, I mean the users, to
choose whether we prefer outline or fill variants, allowing us to
set this directly in the plist file (preferences GUI could be added
later). Even better if you could also allow us to set the weight.
These two settings would let us produce optimal results for our
eyesight and the display used.
