https://www.techradar.com/news/microsoft-stops-development-of-touch-friendly-office-apps

Microsoft has frozen development of its touch-optimized Office apps. The company stopped developing new features for Windows 10 Mobile last year, and according to The Verge, it has now put its lightweight finger-friendly apps on ice as well.

If you're currently using the lightweight editions of Word, PowerPoint and Excel on your touchscreen device, don't be too alarmed – Microsoft isn't developing new features for them, but it's still supporting them and releasing security updates.