I feel like I might be missing something obvious but I can't seem to get the node editing mode to work with the World Properties in the 3D viewport please see below for my World Peoperties
Additionally from what I've read online the default should be for this to be allowed but I'm unable to get it working. Please see an example of what i'm expecting to see taken from another users video.
Any insight is appreciated, I'm new at using this and googling and playing around with the settings hasn't changed much and I'm seeing that it should be available by default.