Be careful what you wish for your viva, because you have no direct control of what will happen. Wishing for this question or that direction of conversation, for a certain length or a particular comment is a distraction.
Be careful what you wish for, because you can draw your attention away from the work you’ve done, the preparations you’ve made and the confidence you’re building.
Learn about general viva expectations. Check the regulations. Ask your friends and colleagues about their experiences. Then get back to getting ready.