From the backlog, how can I filter the tasks that still do NOT have an assigned person? I don't see how to do it.
That is, if I click avatars, the tasks of those people are filtered, OK, but if I want to locate those that have not yet been assigned to anyone, how can I do it?
Perhaps I could (albeit unorthodox) modify the url by hand, https://xx.atlassian.net/jira/software/projects/xx/boards/xx/backlog?assignee=WHATEVER
You could automate adding the term (and probably taking it way) with an automation rule. It's the taking it way part that would be a tad but harder because you would need to substring it out.
Or you could add a custom field (radio button probably) with the value or yes or no. You can hide the field and toggle it on and off using a simple automation rule checking for the value of the assignee.
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Your board should show an avatar to unassigned like this:
And yes, you could change the URL as well, you would then want to set it to"