DLC (downloadable content) Menu

To access the DLC menu, click on the [DLC] button at the top-right of the main menu, as indicated below.
On DLC menu, you may click [On] button to enable a DLC or click [Off] button to disable a DLC.

For the City Economic Simulation DLC, you may enable the Survival Mode if you like the challenge of building a nation from the ground up.  When the Survival Mode is enabled, the options available on the New Game Settings menu will be different to reflect the new gameplay mechanism.