Microsoft is dropping a new Windows 11 preview build for Insiders in the Dev Channel, and it has a new feature that enables handwriting entries directly into fields throughout the OS. You can check to see if it's available by going to Settings > Bluetooth and devices > Pen and Windows Ink, which is under “Shell Handwriting. Lastly, although you can write inside fields, you can’t convert handwriting to text within some 365 apps like Word documents and Excel spreadsheets