Apply fixed width to dot labels
By default the dot labels have auto widths each depending on the length of the label text.
To apply a fixed width to dot labels go to Divi -> Theme Customizer -> Divi DotNav -> Label Settings and find the APPLY FIXED WIDTH setting.
Enabling the APPLY FIXED WIDTH setting applies a default width of 120px to both active and not active dot labels. You can change those values to whatever value you need using the LABEL WIDTH and ACTIVE LABEL WIDTH settings that appear below when the fixed width is enabled.