This is one of those handy tips can save a lot of time to newcomers.
Instead of the tedious job of exploding your polyline to fillet with arcs, follow the below steps:
Of course you can disable the "apply to all corners" option and set the radius for each junction. You can also choose to Chamfer the corner(s) instead of Filleting them.
Hint: The next node you pick will have the fillet option ready to go in the pet palette.
The original thread can be found here.