How to Change Default Start Company in Ax 2012

If you always want to see your company whenever you open Ax 2012 instance, you just need to do a small following setup;

Login to Ax instance

Navigate to File -> Tools -> Options -> General -> Options ->  change start company accounts from company xxxx to xxxx;

Save the changes.

Close the instance and reopen it, you will see the newly selected company is opened as default company.