Since I installed OS10.115 El Capitan on my iMac 24 2.66gh 4 g memory I have a retangular around my pointer box, how can I get rid of him?

Given that I have installed OS X10.115 El Capitan on my iMac 24 4 g memory 2.66gh I have a rectangularbox around my pointer, how can I get rid of him?

In the menu bar, you select

 ▹ System Preferences... ▹ Accessibility ▹ Zoom ▹ Zoom Style: full screen

Tags: Mac OS & System Software

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