Apologies if already flagged, but when in the CSS editor on the left of the layout builder, if you CMD + Z undo it also undoes on the builder itself meaning when you go back to it you have to redo!
Thanks! I’ve not seen this reported yet, but I actually fixed this earlier today as part of addressing something else. After the next patch the undo/redo shortcuts will not fire if you are focused inside an input or code editor.