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I have done two things regarding completed projects: first, I usually use the "active projects" view, which does not display completed projects. Second, I made a special folder for storing completed projects that I don't want to delete, and set it to be inactive.

Still, I wish there was an automated way to get rid of them, especially keeping them from popping up in reviews. There's a thread of ideas on this somewhere in the forums. I don't remember if there was a conclusion.