Hey @Andy_Shuke
Nice to hear from you again!
We’ve had a few requests for Dark Mode in Codebook for Windows and it is something on our radar.
Currently we are finalizing the next major, highly requested, feature (Image + PDF attachments) for external beta testing. Near the end of last year we had posted a few development updates to our blog and the discussion forum outlining what we’ve been working on and what’s coming. This one has a preview video of image attachments: Coming Soon to Codebook, Fall 2020
Including Dark Mode in Codebook for Windows is something we’ll most likely revisit when looking into an interface redesign (also on our longer term roadmap).
We’ll continue to post updates here to the discussion forum and our blog