Open Peer Review can refer to various practices, including signing your review, publishing reviews along with the paper, and allowing for the community to contribute to the peer review process.
Check Transpose for the review policies at your preferred journals.
More information
The Turing Way has a chapter on Peer Review, including a section on Open Peer Review.
Check the Open Reviewers Review Guide. Pages 28-31 provide insights about what a reviewer would look for when evaluating your manuscript.
Read some reflections on reviewing in the publishing system.
Blogpost: Peer Review and the Future of Publishing