In the Themes & Styles module, if I modify the padding and margin settings for the pages and then apply these changes, will they be applied to pages that were created prior to the modification? Does the same principle apply to background images and fonts as well?
Padding, margin, and background will remain unchanged for earlier pages or elements unless the user applies the default style of elements in the previous or new pages. The updates to these elements will then align with the theme.
What about Font & Color Pallet ?
Yes, Font and Color Pallet is applicable to all the pages in your application.