Selecting "Not Assigned" as a Technician - Custom View

We have just migrated to the new on demand Service Desk Plus - and I am trying to recreate a custom view from the old On Prem SD+.

What I want is a view that will show all calls assigned to me, and any new calls that have not been assigned yet.

In the old SD+ I had the option to select "not assigned" which would achieve this purpose, but this does not seem to be available in the on demand service.