The question is in the title. I have seen a few articles and answers talking about configuring .xprofile, file that is supposed to be in my home directory. I have selected "show hidden files" but .xprofile is nowhere to find. Any idea?
By default there is no .xprofile file in your home directory unless you create one. The instructions for making an .xprofile file are found here under the How to setup a dual monitor heading in the Ubuntu Resolution wiki.