There is no "Cancel" button on the Add and Edit Process windows
You should include a "Cancel" button on the Add and Edit Process windows (see the macOS HIG section on dismissing dialogs). I know the red x button cancels the changes, but this isn't obvious, and putting "Cancel" next to "Save" would make it a lot more obvious.
Also, if I'm being super nitpicky, the word "process" should be capitalized in the window titles for "Add Process" and "Edit Process". :)