Users can randomize the agent types distribution of the group agents with the Agent Randomizer Tool.
The tool is accesible via the Atoms Menu: Atoms > Tools > Agent Randomizer.
Alternatively you can access it with the shelf button 
Select your agent group node from the gui.
Select the agent types you want to apply to your agent group, then press the arrow button to move the agent types to the right list.
You can adjust the sliders to randomize the agent type distribution.
Activate the "On selected agents only" if you wish to run the randomizer only on the selected agents.
Once you are happy with your selection, click on the "Run" button.
Click Rewind to reset your simulation and see the new agent distribution.
Please make sure you reset your simulation before running this tool. If you fail to do so, the "Agent Types" list might result empty.
