Currently the "Created by portal user:" filter is basically impossible to use if you have more than a few portal users. It's not in any order and you can't search within it.
Also would be helpful to have a "NOT" option just like all the other filters should have so you can do a negative search, like only show the ones not created by this user or these users (i.e. wanting to filter out the ones created by users of a certain domain).
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