To corner off an area, fencing can be a great option and it can be used most outdoors too. Rabbit play Pet and fencing for in and outdoor use
These Yaheetech Dog Playpen, comes in packs of 8 Panel or more and comes in hights of 60cm, 80cm and 100cm. They can be used for Rabbits, guinea pigs and Dog as fence and Exercise Pen. The pen is portable and adjustable and can be used indoors and outdoors.
Small breed rabbit fence enclosure: https://amzn.to/3muFtYS
Large breed rabbit fence enclosure: https://amzn.to/3KCyDs7