I had the Features Tool Bar, alongside the Sketch Tool Bar, and somehow I have caused it to go missing :-(. SO;
Problem #1 is to get that back.
Problem #2 is, knowing that Features are also under the 'Insert' pull down, I have tried to FILLET the attached part, however while CHAMFER is in that pulldown, FILLET is not, but is part of the Features when it is on the Design bar of the main screen. I may be using the wrong terminology, hopefully my intent is clear.