The desktop no longer extends to the left side

This problem,could be a problem with the monitor or the graphics card. You need to test your computer with another monitor at the same setting to see if the graphic card is having a problem with the setting. Also test the monitor on another computer with the same setting and see if you still get the problem. You can also try using a different graphics card in your computer to see if the graphics card is having a problem. Setup the new card for the same settings and see if you still have the problem.The customer support telephone number for Envision is .1-888-838-6388. Their customer support website is. www.envisiondisplays.com. They should be able to help with your problem.I hope this information helps you with your problem.