Hey RGB,
it is difficult to tell why the dotted navigation behaves strangely on your website without access to the back-end; when I tested it on Kanso demo it was highlighting the right dots at the right times.
In order to force the theme to display all posts as full-width, please download this custom file, unzip it, and upload the contained files into the theme folder (/wp-content/themes/Kanso/), replacing the existing files.
Best,
Andrii / Satori Studio