How do i get 4.0 like autosmooth in 4.1?

Support Basics & Interface
1

I want to know how to get it done now what was essentially one click in 4.0. That same smoothing.

2

Right click the object and select “Shade Smooth by Angle”.
Alternatively, add the “Smooth by Angle” modfiier to the object.

3

Blender 4.0 and blender 4.1 are the same.

If your question is about the difference from blender 3.6, the autosmooth treatment in blender 4.0 and later versions is completely different. (The modifier includes autosmooth.)