If you no longer need access to a storyboard, you can archive it and have it removed from your Project Dashboard. Archiving a storyboard also means that anyone you've shared the presentation mode URL with won't be able to access it anymore.
Open the storyboard that you'd like to archive and click the three dots icon. From the dropdown menu, choose the Archive storyboard option.
Accidentally archived a storyboard?
No worries, it can easily be recovered!
Head to your Project Dashboard and click the Archived Projects & Storyboards icon in the top right hand corner. You'll then see a list of all your archived storyboards and will be able to restore them.
Here you can also completely delete your storyboards from the database, if needed.