What is the best way to organize the frontend architecture?

Question

Frontend

There are several ReactJS SPA services, the goal is a common authorization for them all in one place,
i.e. logged into one service and then when switching to another service, no login is needed.
Have you encountered this problem and how did you solve it?
You can do something like a microservice front (mosaic, etc.), but it's probably pointless since even the header can be different in projects.