屏幕放大镜跟放大字号有所不同，这个特性就像一个玻璃放大镜，可以移动放大不同的屏幕区域。
Open the Activities overview and start typing Accessibility.
Click on Accessibility to open the panel.
Press on Zoom in the Seeing section.
Switch the Zoom switch in the top-right corner of the Zoom Options window to on.
您可以移动放大的屏幕区域，把鼠标移到屏幕不同区域，就可以放大那里，您可以查看放大的区域。
您可以在顶部面板上的辅助功能图标中，快速启用或关闭缩放特性。
You can change the magnification factor, the mouse tracking, and the position of the magnified view on the screen. Adjust these in the Magnifier tab of the Zoom Options window.
You can activate crosshairs to help you find the mouse or touchpad pointer. Switch them on and adjust their length, color, and thickness in the Crosshairs tab of the Zoom settings window.
You can switch to inverse video or White on black, and adjust brightness, contrast and greyscale options for the magnifier. The combination of these options is useful for people with low-vision, any degree of photophobia, or just for using the computer under adverse lighting conditions. Select the Color Effects tab in the Zoom settings window to enable and change these options.
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