Press CRTL+ on the keyboard to enlarge the middle picture. Press the CRTL+ minus key on the keyboard to reduce the middle picture. Press CTRL+ SPACEBAR on the keyboard, and the mouse pointer will be displayed as a magnifying glass icon. Press the left mouse button and drag to select the area to enlarge. Press CTRL+ SPACEBAR on the keyboard, and the mouse pointer will be displayed as a magnifying glass icon. Click the left mouse button to enlarge the image centered on the current mouse position. In the non-text editing state, press ALT+ SPACEBAR and click the left mouse button to zoom out the image with the current mouse position as the center. Press the ALT key on the keyboard and scroll the wheel forward, and the image will be enlarged with the current mouse position as the center. Press the ALT key on the keyboard and scroll the wheel backwards, and the image will be reduced around the current mouse position. Press the CTRL +SHIFT key of the keyboard, click any picture with the mouse, and all files opened by ps will be enlarged at the same time. Press the ALT +SHIFT key of the keyboard, click any picture, and all files opened by ps will be reduced at the same time.