Currently you can only delete the entire recurring unavailability. It would be great if you could delete one single date in the recurring date. (example image attached)
Thanks for voting everyone. I'm happy to announce that we are currently revitalising our set of Unavailability features. We think this is a great suggestion. Stay tuned.
@Declan Haigh: I think you did this and now a casual who applied for Mon-Fri unavailable until January required me to approve every day individually for the whole 6 months. Do you understand how frustrating and time consuming it is to do this?