@Orhangazi44 is right. rviz displays all frames that are present in the tf tree (i.e. broadcasted to tf using a tf broadcaster), and, by default, just map.
If you, however, just want to visualize the point cloud data in the frame it is sent in, it typically is enough to manually type the frame_id in which the data is published (check the header/frame_id field with rostopic echo) in the fixed_frame field in rviz.