Find where that button went!
Check out the new tools!
New keyframes and more!
New render engines and more!
Check out what was the same between 2.79 and 2.80 but has changed in 2.81
The old layer system has found a new place in Blender 2.8. The layers are now called view layers and can be found, named and selected in the top right of the user interface. The passes for compositing can be selected in the View Layer Properties tab. The selection is immediately reflected in the Render Layers node in the compositor.