In October 2019, Microsoft revealed a ‘new expression’ of Windows 10 called Windows 10X. Microsoft says this new version of the operating system is optimized to work with dual-screen or multiple screen/posture devices, such as the Surface Neo, Lenovo ThinkPad X1 Fold, and Intel prototypes. Windows 10x will be released for beta testing, but Microsoft won’t be delivering its Surface Neo dual screen device this year. Microsoft’s new priority is to work on the existing single-screen devices first. Surface Neo is powered by Intel’s new processor, and uses Windows X to span traditional and UWP apps across two screens.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10x-latest-news-and-info-on-microsofts-upcoming-os/