A:- How to manage Prebuilt Theme Color?
(a) From your dashboard, go to the Appearance > Customize > Style Configurator > Prebuilt Theme Color
(b) Here you can manage prebuilt theme color.
(c) Click on Publish.

B:- How to manage custom primary & secondary colors.
(a) From your dashboard, go to the Appearance > Customize > Style Configurator > Custom Color
(b) Here you can manage custom colors.
(c) Here you can manage custom primary & secondary colors.
(d) Click on Publish.