You're not required to provide the worker with another copy of their P45 if one has already been provided to them. Access Pay & Bill is also designed in this manner, and you can't re-print a P45 from a previous period.
However, you can take a screenshot or snippet of the P45 within the PAYE Form Enquiry, and you can provide that to your worker.
This is at your discretion. To view the worker's P45 in PAYE Form Enquiry, please follow these instructions:
Click Workers then click Movement.
Click PAYE Form Enquiry then enter the Worker Ref.
On your keyboard, Press Tab then Double click on the part under Form.