Reversing Monitor Everything On Screen Appears Too Large For The Monitor?

Everything on screen appears too large for the monitor? - reversing monitor

After installing a game on my pc yesterday ISH new perspective, no longer corresponds to the image on the monitor, so that only an enlarged left upper corner of each window is visible, and on the desktop. If I play on my old PC used, it had triggered a moment after each game, but still be updated automatically after a few seconds, how to reverse this trend? Please help!