DVT VHDL IDE User Guide
Rev. 19.1.35, 18 October 2019

35.21 How do I change the background color of the Editor?

Go to Window > Preferences, then navigate to General > Editors > Text Editors. In the panel on the right, from the Appearance color options list select Background color, then use the color picker to chose the desired color (the System default checkbox must be unchecked).