- Ensure that you have the Maplex Label Engine enabled and that you have specified the Street Placement style for labeling.
- Click the Label Manager button on the Labeling toolbar.
- Check the check box next to the layer you want to label.
- Choose a label class under the layer.
- Click Symbol.
- Click Edit Symbol.
- Click the Formatted Text tab.
- Type a value for the word spacing.
- Click OK to close all dialog boxes.
This will be the minimum word spacing when you choose to spread the words in your labels.