Hide section dots from dot navigation
To hide the dot of a specific section first add the chiddn_hide_section_dot CSS class to this section in Section Settings -> Advanced tab -> CSS ID & Classes toggle -> CSS Class field.
Then go to Divi -> Theme Customizer -> Divi DotNav -> Dot Settings and set the SHOW/HIDE SECTION DOTS setting value to Hide.
This will make all the dots of the sections that have been assigned the chiddn_hide_section_dot CSS class disappear from the dot navigation.