Whenever I add any new page built with the Advanced Layout, the font color remains black even if it’s changed to white. This problem is only with pages and not with posts.
Your using a special heading element there. You can edit the special heading element and click on the colors tab to change it’s color.
Or you can edit your color section and set the style to “alternate color” and then change the styling for your alternate content areas in Dashboard > Enfold > General Styling > Alternate content.