We can profile the Editor itself. This is normally used when trying to profile the performance of custom editor scripts. This can be achieved by enabling the Profile Editor option in the Profiler window and configuring the Connected Player option to Editor, as shown in the following screenshot:

Note that both options must be configured if we want to profile the Editor: if nothing happens in the graph, then it is possible you have not selected the Profile Editor button, or you may accidentally be connected to another game build!