Famille de logiciels de traitement de texte Microsoft pour la création de documents web, d’e-mails et d’impressions.
Thanks for the update and sorry about the misunderstanding. It would seem that there is no easy way to do this for the MacOS version of the app. However, I have found a couple of links for you to check and see if anything there helps you.
The first is a link from Microsoft Support on the Windows version of the app. Perhaps the instructions there would be valid for your version of the app as well. https://support.microsoft.com/office/customize-or-create-new-styles-d38d6e47-f6fc-48eb-a607-1eb120dec563
The second is a link on how to access the color scheme via an alternate method. https://www.brandwares.com/bestpractices/2015/05/xml-hacking-color-themes/
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.