How do you locate and uncheck the Default Dashboard checkbox?

Sugar documentation says the checkbox for the Default Dashboard is automatically checked from out-of-the-box. I want to uncheck it so my users can set up their own dashboard that appears as their default home dashboard each time they go online from their desktop browser to https://[CompanyName]

If found the documentation that talks about unchecking the Default Dashboard checkbox but I cannot figure out how to navigate Sugar to get to and uncheck the checkbox. I am an Admin in Sugar. 

See attached screen shot of the documentation.