Do you have ideas that you didn’t have time to develop during your PhD?
Questions you maybe asked at the start that now at the end don’t have answers?
Or perhaps a section or chapter you were going to write but weren’t able to?
Review loose threads, unfinished projects and half-formed ideas as you prepare for the viva. The work at the edges could be of interest to your examiners, and you’ll be able to share it with them if you’ve spent a little time in preparation for that possibility.
More importantly, by contrast, you’ll see why the work that is finished got done. Ask yourself why unfinished projects didn’t make it, and you’ll get a sharper sense of why the work in your thesis got to completion – what was different about what made it in and what didn’t?