I'll open PowerPoint on my Window 10 computer but it looks like he opens PowerPoint to a second screen, but there is no second screen connected.
Sometimes it happen I enlarge my first screen but not today.
Update: If I click on the icon of PowerPoint on my task bar, the application moves to the direction of the arrows.
Best Answer
This can happen when we have previously connected an external screen. If PowerPoint appears on the taskbar, right-click an empty space on the taskbar and select
Cascade windows
to see if it returns to the main screen.If that doesn't work, hold down Shift and right-click the PowerPoint icon on the taskbar. Choose
Move
and when the 4-way arrow appears, press one of the arrow keys and move your mouse.(Source: Bring Misplaced Off-Screen Windows Back to Your Desktop)