You have a point, because in the original version 0.9 it was a problem. First, make sure you install all the updates: Tools> Plugins and click Check for Updates .
The next time you want to split your schedule, make sure you select the categorical attribute for this. Then click the black palette icon that is used for color nodes and select Attribute . Check, Clement Levallois' excellent tutorial , slide 25 in pdf format, for more details
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