Setting the active build configuration

One of the project's build configurations is active, that is, used by default in the project builds. The active build configuration appears in the Project Explorer next to the project name:

To select a different active configuration, open the Manage Configurations dialog box (Project > Build configurations > Manage on the menu), click the configuration to be active, and click the Set Active button.

Another option is, right-click the project name in the Project Explorer and click Build configurations > Set Active and the required configuration from the context menu.