Facebook has pushed a new update for Messenger today for Windows 10 devices with no new features included but brings various big fixes and performance improvements. Now app supports Landscape mode and brings notification and live tile improvements.
Still the landscape mode is unstable and buggy and there are app scaling issues, some part of the app misses in landscape mode. However developers will fix this possibly in next update. The app overall performance is good compared to performance before update but still the app lacks with speed and is little buggy.
You can grab the latest update from below app box: