Adding a manual sort option for cards within the Noteboard has been on the horizon for a little while now. We’ve been waiting to add this as manual sorting is a little more complex on Supernotes due to the shared nature of cards. If this would be helpful for you, please like this post so we can gauge interest.
A similar thing I’ve sometimes wanted is the ability to pin a few child cards to the top, while still letting all the others sort normally. Don’t know if that helps or adds more complexity. 
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