You can center the text, of course, but Access reports don't natively support stretching text out to fit a text box control.
- Can you provide a screenshot of the report showing how much space you have to fill in this control and how much text is actually in it?
- Also, what problem are you trying to solve by doing this?
It's probably possible to insert spaces between the letters in a given string of text in the control,using the Space function. However, that would require a VBA function that runs on every field in every record where you want to achieve this. It's doable, but might be pretty slow.