Microsoft's SwiftKey app on Surface Duo can now be used when spanned across both displays in thumb typing mode. This allows users to use both their thumbs on either screen when in dual-screen mode to type, making typing much more comfortable.
SwiftKey recently passed 500 million installations on Android devices. SwiftKey is one of many Microsoft apps to hit the 500 million installs milestone, alongside Excel and PowerPoint. Multiple Microsoft apps have also reached 1 billion installs.
Some users received a warning from Google regarding SwiftKey's access to their Gmail accounts. The warning is likely due to upcoming API changes that Google is implementing to limit third-party access to Gmail.