Coreldraw Standard 2020 Themes

Just purchased Coreldraw STANDARD 2020, I've been searching everywhere and cant seem to find any settings to change the theme. Didn't have this problem with Coreldraw 2019 I had at work but granted that was coreldraw graphics suite. Is that just not an option with the standard package?  The bright white background is making it difficult to work on anything for very long without killing my eyes.