fillet all corner at once

we can round the corner of geometry or polyline at once..

1. type 'f ' in command line then hit space bar
2.type 'r' to specify desired radius
3.type p(polyline) to select the polyline geometry.
4.finish fillet.

*'m' is for separate entities to be filleted(for separate several corners, need to click each line but setting once)

Reference: https://forums.autodesk.com/t5/autocad-forum/fillet-multiple-corners-at-once/td-p/2553630