Square presentation instead of a rectangular one


All the prezi templates are standard rectangles and I’ve been asked to give a presentation in an organisation that uses a laptop to view projected onto a square wall screen and I’m advised that rectangular presentations ‘fall off’ the screen and i need to use a square one.

Can this be edited so I can use prezi or am I stuck with powerpoint




Please know that you can stay within a square as your “working space”, for example: