Sorting Inbox by Sender Doesn't Work
Initial sort by sender function may work, but switches back to sorting by date when a large number (eg 20) of emails is deleted or moved. After this, it's almost impossible to sort by sender again. I've tried refreshing the page, closing and re-opening mail, and now and then the sorting is enabled again. So 80% of the time, sorting by sender does NOT work.
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marv acuña commented
Same behavior observed in my inbox. This was working fine before.