Have a Reset function in the Master View to re-set a modified Layout in synch with its Master
In the Master View: add the same "Reset" function as it is available in the Normal Slide View, in order to re-set a modified Layout (moved Footnote for ex) in synch with its Master.
John Korchok commented
PowerPoint already does this. In the layout, uncheck Footers, then recheck it. Voila! It's reset!