Hi I applied for the visa online in a country that allows non-residents to fill out the eVisa. Currently documents being checked. Can I leave this country and go somewhere else for a few days, or do I need to stay here until the visa is approved?

I will submit my application on May 7th for retirement visa. It takes approximately 15 days I have been advised. I don't intend leaving Thailand until 27th May and I have been advised that is ok. As far as travel within that 15 day period it will be necessary for me to go to Sakon Nakhon for 2 days and return to Hua Hin where the application has been submitted. Now my simple question am I allowed to make that journey within the 15 day period. I have heard people say you can't go anywhere for 15 days as immigration may check you live at the address given