I have added the title to the top of the pages and centered the page numbers at the bottom in the engrave mode, but those adjustments don’t transfer when I return to the score. Any help would be appreciated.
This is probably happening because you have Page Overrides (the little red triangles on the page icons, in Engrave mode’s upper right panel). If so right click on the page icons and choose Remove All Page Overrides. Otherwise, please upload the Dorico file, to see what is going on.
(Also, for the title in header, it would be better to use a token, instead of normal text)