Moneydance allows you to choose from multiple colour schemes or create a custom theme.
To access your Appearance preferences, choose File > Preferences > Appearance.
(On a Mac, choose Moneydance > Preferences > Appearance).
This feature is not available if you're using Moneydance 2020 or an older version
Select the "Theme" field, and choose from a number of themes.
To create your own theme, select the "Theme" field and choose a theme.
Then select "Customize" on the right to amend the selected Theme.
If a particular theme doesn't support customisation, the "Customize" button will be disabled.
You'll then see the "Customize Theme" window (in the screenshot below).
Select the item you want to change, and another window will open where you can select the colour.