Guilherme explained that the first thing to consider is your content. He suggests the ideal proportion to follow while creating a Prezi Video presentation uses half of the screen for the content and the other half for the presenter.
Important note: If you have too much content, Prezi Experts recommend breaking down the content in different frames or different screens to keep the same proportion (half and half) throughout the entire presentation.
On the one hand, if you have a lot of information and cannot break down the content on different screens, Guilherme recommends using 2/3 for the content and 1/3 for the presenter. If you have a straightforward presentation with keywords or visual metaphors on the screen, you can use 1/3 for the content and 2/3 for the presenter.
The second parameter to consider in the design is the distance the presenter will be from the camera. Sometimes the presenter wants to be in full body on the screen (very far from the camera) and have some elements to interact with. Some others want to sit down closer to the computer screen, where you just see their face.
Prezi Video has different layouts, and your choice will depend on the amount of content to be shown the presenter’s preference, and the audience. The proportions are as significant as the presentation design.