Enable dot navigation labels
Divi DotNav plugin uses section IDs as labels for corresponding dots of the Dot Navigation. Before enabling the dot labels first you need to add the section IDs.
To add an ID to the section open the section settings modal and add it into the Section Settings -> Advanced tab -> CSS ID & Classes toggle -> CSS ID field.
Then go to Divi -> Theme Customizer -> Divi DotNav -> Label Settings section. By default the labels are disabled and only the SHOW DOT LABELS setting is visible.
Checking the SHOW DOT LABELS checkbox will enable the dot labels for the dots, sections of which have been assigned an ID, and a set of settings for customizing the labels will appear below.