Thanks for bringing this up, and apologize for the late response. Currently, you can only view multiple cameras using the immersive view feature on the Google Home app. With an immersive view, you can check all of your cameras in one view and control all of your Nest cameras, without the need to select each individual camera.
We're always looking for ways to improve - we'll take this as feedback, and we'll gladly pass it along to the team. You can also send feedback using your device by saying, "Hey Google, send feedback." Visit this link for more steps.
Let us know if you have additional questions or concerns about your device. Otherwise, I'll close the thread after 24 hours.