Regulations & Requests
Thesis examination regulations underpin viva expectations. They set out how examiners should generally approach the viva and how they should behave. Coupled with practice and culture this gives rise to expectations and patterns. Things tend to happen in certain ways.
This doesn’t mean that viva expectations are the only way they can proceed. In particular, if you need something that doesn’t follow past patterns then you should ask for it. If you need more breaks, a specific room setup or have other particular requirements then your examiners need to know.
Vivas follow regulations but those regulations are there to help ensure that vivas are fair for all candidates. If you need something make sure you make a request. Don’t hope. Don’t expect that people will somehow know.
Check and follow the regulations. Make requests for what you need for your viva.