当光标在桌面下半部时，放大镜在顶部，当光标在桌面上半部时，放大镜在下部，点击比例上下箭头可改变放大镜的比例。-When the cursor is in the the desktop lower half, magnifying glass at the top, when the magnifying glass in the lower half of the cursor on the desktop, click on the proportion of the up and down arrows to change the proportion of the magnifying glass.