If you create a solution from template with themes created by Theme Designer you may face the challenge of editing it with Theme Designer Add-in.
To save changes of existing theme for this case, please follow the next steps:
- Open Theme Designer and change needed theme
- Save theme as new with a new name
- Apply the new theme to the current page or master page (as original theme)
- Than choose original theme, click on 'Apply Theme' on the ribbon again and Unapply original theme
- Refresh the page and check if changes applied. If everything works as expected you can delete original theme and rename the new theme on Add-in home page