Select the Designer Theme

By default, the Designer uses a light theme to set the color palette for your work environment. To personalize your environment to use a dark theme or sync with your OS settings, click Theme from the menu in the header and choose an option:

Description of theme-express.png follows

Description of the illustration theme-express.png

Select Light to use the default theme.
Select Dark to use a dark color display, more suited for low-light conditions. This option switches the background and text used in all the editors, except the canvas, where application pages continue to display against a lighter background with dark text.
Select OS Default to inherit the theme used in your operating system’s settings. If your system settings are configured to use dark mode, the Designer also uses those settings.