How To - Present A PowerPoint Without Sharing Your Screen

Here are the steps to get a PowerPoint to present in Teams without needing to share your screen.

Have the PowerPoint file closed to begin with
Have Teams open and either start a meeting or join an existing meeting
Don't share your screen
Open the PowerPoint file and look for the button (top right corner under your facephoto in the screen shot below to "Present in Teams"
That button will start the PowerPoint at the first slide and there will be a forward and backward button to move from slide to slide