What do you not want to talk about in the viva? What topics or questions do you dread?
Hoping they won’t come up won’t help. You have to engage with them somehow in your prep, otherwise you’re walking towards the viva with a big worry strapped to your back.
Consider the opposite: what do you want to talk about in the viva? What are you hoping your examiners will ask?
Reflect a little on the topics you want to talk about. What makes them that way? Work to make the topics you dread more like that. How can you improve your understanding of something? Can you get a friend or your supervisor to ask you questions? Can you write something that will help you unpick an idea?
It’s not enough to know what you hope won’t come up in the viva. You have to then figure out what you’re going to do as a result.