As you are using Prevalent Free WordPress theme, which is build in WordPress customizer whereas the Prevalent PRO theme is built in more user friendly Theme Options panel. The PRO version contains lots of sections in home page for creating beautiful and professional website.
So you can’t access Theme options in free Theme
In free theme,the homepage displayed with right sidebar widgets. Their is no way to show it in full width without sidebar.
Please check and let me know your feedback.