THEATER Dipol T 500 D 16: How do I set the switch for which mode?

In current dipole models of the THEATER line, T 500 D 16, the two positions of the switch for dipole and normal mode are not individually marked. The following modes can be selected, as also described in the manual:

• Toggle switch in the direction of the wall > speaker is set to dipole mode
• Toggle switch in the direction of the room > speaker is set to normal mode