Styling cannot escape placeholders.
So if you have a prefix like <blue>Admin the prefix will turn blue but you're username is still white (default).
In this guide I'll show you how you can use the color meta tag of groups in LuckPerms to change the color of your display name.
At the end I also show how you can do this based on dimension.
You have configured LuckPerms groups for your server and set up prefixes display in chat by adding it to display_name.
If you don't want prefixes, you can remove them by searching for %luckperms:prefix% in your config file and replacing it with nothing.
If you want suffixes as well you can find ${default}" and replace it with ${default}%luckperms:suffix%".
