Hello,
You can customize the group layout in the "Edit group" window - right click group name or open main menu and click "Edit group".
More info about layouts:
https://github.com/fastaddons/GroupSpeedDial/wiki/Group-layouts
See also introduction video for more tips:
https://www.youtube.com/watch?v=mgAJTjrcIRI
Best Regards,
Juraj Mäsiar