The patent was filed in June 2017 and described in the background technology of the patent.MicrosoftExplains how to install multiple cameras for computing devices, and each camera can be enabled for different user usage patterns. In the patent, Microsoft writes that devices with multiple screens can include multiple microphones and speakers.
The patent says that a multi-screen device will have one or more front-end cameras, and each of the two screens will have its own front-end cameras. There are also rear cameras on the back of each screen. When the user unfolds or folds, the camera module is activated according to the device configuration.