Control the PowerPoint window

If you see a Restore button, that is an indicator that the window is already maximized.

You will run into problems if you are working in a window that is not maximized, but has been sized (stretched) to take up the entire screen. If your window looks "full size" but still has a Maximize button, be sure to shrink the window so that it is visibly smaller than the screen. Then click the Maximize button to maximize it correctly.

Select Fit and PowerPoint will set the zoom automatically to show the entire slide in the available space in the slide pane.

You can zoom in (a larger number) to work with smaller objects and to fine-tune positioning.

You can zoom out (a smaller number) to see more of the page or document.

You can also click in the Zoom box itself, type a number and press Enter