There are good reasons to have your supervisor present at your viva.
They can be moral support. They can make notes on your behalf. You could feel like it’s a fitting moment in your working relationship.
There are good reasons to not have your supervisor present at your viva.
You might be distracted. You might not want an audience. Perhaps you don’t have a good relationship with them.
Either way it’s your decision; you get to choose and that’s that.
Reflect on what matters to you.