Hi @Philip Greenfield to unarchive a list select "Archived Items" under "More" within the board menu. Then click "Switch to Lists" near the top of the page, then choose a list and click "Send to Board". (It may already say "Archived Lists" at the top, in which case you won't need to click "Switch to Lists.")
This link provides the step-by-step:
Please let me know if this helps.
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