Beg to differ Nancy,
Code color choices are very subjective.
Indeed they are but the bulk of users would recognise a poor choice, pale green with white is not the best contrast to use.
If you can't edit CSS code, then DW is not the right tool for you.
I CAN edit CSS perfectly well. I just do NOT see why I should have to go through such a convoluted process to make a simple change.
I am not as I mentioned color blind but anyone who is, would have the same issue as me.
This is NOT at all user friendly. I have better things to do than post questions about things that should be easier to find through the interface or help options..
McP
And I am having a ball, adding and modifying themes. Just have a look at what I have so far.

How do I get the themes? By going to the likes of Brackets Themes and copying the contents of the CSS file. I then go back to the Dreamweaver Preferences panel Click the
button, give the theme a name, hit the edit button and replace the current content with my clipboard content. Presto, new theme! BTW, the Visual Studio theme is horrible.
Should this be automatic for Dreamweaver? Certainly not! There are so many themes from so many sources, that I think that it would stymie creativity if we were stuck with just those themes as dictated by Adobe.