If you don't want to share your professional knowledge and experience with employees in other departments, then you can politely refuse their requests, for example, you still have a lot of work to deal with and no time for training. If you think that sharing your experience and knowledge is valuable and can help employees in other departments to better handle platform infringement complaints, then you can consider training. During the training, you can share your experience and knowledge, but you can also emphasize that your major is legal affairs, and employees in other departments still need to know their responsibilities and scope of work.

In short, you need to decide whether to train according to your career development and the interests of the company. If you are not sure how to deal with it, you can ask your supervisor or human resources department for advice.