PowerPoint shown on all dektops

I open the PowerPoint application on my MacBook Pro and my problem is that when I swipe between desktops, PowerPoint is there every time.

My point is that, whenever I'm trying to do a work using multiple applications, say write an essay on Word about a reading. I would have Word open on Desktop 1 and Safari on Desktop 2, and I would easily swipe with 4 fingers to see the content on Safari and swipe back to keep on writing on Word.

This doesn't work with PowerPoint since when I swipe to see the other app, PowerPoint appears again and in front of all. If I had 5 Desktops, iw will appear on all of them. This is really annoying. How can I solve this?