Impress Slides not Displaying Properly at All

I’m on Windows 10, using the newest version of LibreOffice Impress. When I press “Start from First Slide” or “Start from Current Slide”, this is what I see:

The screen is completely mushed together, and the text doesn’t otherwise display. The original document is a default template:

I need to give a college presentation, and this is not a help. Is there a way to fix this weird problem?