Do you have this setting set in both workspaces?
Also are your workspaces in different layout modes? Check to see if they both have this double arrow icon in top right or not. This is the symbol for the classic editor. If not in the classic editor, sometimes the undo/keep buttons are harder to find because they are in the breadcrumbs now. You can toggle between editor classic and new layouts with Ctrl + E.
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Here is an explanation of where the undo/keep buttons are depending on the layout.
