In Jerusalem

The smart Siddur will adjust its' calculation for Purim, Shushan Purim, and Megillah Reading if you are in Jerusalem.

The "In Jerusalem" setting allows you to select if you are in Jerusalem or not.

You can access this setting by tapping the gear button on your screen or by selecting Menu > Siddur Settings. Note: Depending on your device and/or app version, this menu may look a little different.