It shows up per default because it affects you. If you like a filter, feel free to file a feature-request on Lemmy's Github.

Make sure to include a proper description of what you'd like and why. Otherwise I doubt it'll get accepted as it makes the modlog a bit counterintuitive to use. Things that affect you everywhere won't show up just because of their place of origin. That might be unwanted on a federated platform. But feel free to disagree, just include your argumentation and let the developers decide.