There are two topics of the same thing (I need to pick the brain of someone familiar with SeisComp5 - Technical Support - Raspberry Shake), I’m gonna answer here again:
Unfortunatly, Seiscomp is not compatible with the stream codes “?” and “*”. You can have only one channel at a time. If you set detecStream as “EH” for example, your detection channel will be set by default to Vertical (Z). This means that SCMV can only show one component at the same time, so it’s impossible to show 3 of them.