Right now when e.g. adding or editing a component, the config dialog only has a 'Close' button. However, I find it more intuitive to have an 'Ok' and 'Cancel' button. The 'Ok' button would kinda serve as the current 'Close' button, i.e. applying the changes that were made to the component. The 'Cancel' button would allow you to discard the changes that you made in the config dialog. This can be accompanied with a confirmation popup dialog of whether the user really wants to discard the changes. This can also be useful when you added a component, but don't really wanted it. Instead of having to delete that components afterwards, you could just hit cancel on the dialog that popped up when you added the component.

Also: if you would close the dialog with a shortkey (e.g. Cmd+w on macOS), or with the window's close button (e.g. X button on the top right on Windows, or the red circle on the top left for macOS), it would be equivalent to the 'cancel' action.