You can change the size and the grouped by resource GroupHeader. To do so you can implement your own or modify the existing GroupHeaderContentTemplateSelector, GroupHeaderStyleSelector for the cells that present the resources. Also you can edit the TimeRulerItemTemplateSelector and TimeRulerItemDataTemplateSelector. You can find the GroupHeaders that are rotated by -90 degrees for the TimelineViewDefinition and remove the rotation. This will make the resources height about 30 pixels each.
The default values for these properties can be found in the attached scheduleview.xaml.
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