** This idea is being submitted on behalf of an Esri Ireland customer **
When you have a map in a layout, you can right-click on it and select Activate to alter the map itself. However, it is not intuitive to get the layout back into context. You have to click on the context sensitive LAYOUT tab, and then click Close Activation.
If you could right-click on the map and select Deactivate or press the Esc/Enter key this would be more user-friendly.