Working as an editor in a newspaper that covers diverse topics can be permissible as long as you ensure that the content aligns with the principles of Islam. As an editor, it is your responsibility to review and approve articles or content that will be published. You should make sure that the material is accurate, truthful, and adheres to ethical standards. It is important to prioritize promoting good and refraining from any content that may be harmful, misleading, or against Islamic teachings.