There used to be a "-" icon on the right side of each key binding, but that's been removed. With no help text on how to clear a key binding. Even in the "conflicts" list, there's no help as to how to clear them. When I highlight a binding, and hit "delete" key (or shift + delete), Xcode just enters that as a conflicting key binding. How about just honoring the "delete" key and clearing the binding?
After playing with Key Bindings a bit, you have to select the row and press the 'return' key to be able to add or delete a key binding. Once you press 'return', you'll see the + and - options for the key binding.
(I'm using Xcode 15.2)
Hope that helps
in Xcode 15.4 that doesn't appear to be the case anymore. hitting 'return' does indeed open the field for editing, but there is no option for clearing the value.