This comes pre-enabled on all current OTS maps. If your map switching isn't working ensure you are on the most recent firmware and maps for your unit.
On OTS maps
Focus ST/Fiesta ST - Slot 1 is High Performance, Slot 2 is Economy Mode
Focus RS/Mustang Ecoboost - Slot 1 is High Performance Slot 2 is Economy
Each individual map slot has a multitude of adjustments you are able to make, which can allow you to replace the stock maps with a large variety of options for all sorts of conditions. All adjustments must be made in Accesstuner Pro software by a licensed Protuner