Users of SnapGene 6.1 or later, see Configure Dark Mode and Background Color
How do I change the background color for SnapGene windows?
For SnapGene 6.0 and earlier, the default background color is "Off-White".
Open Preferences
Click SnapGene → Preferences (macOS) or Edit → Preferences (Windows or Linux). If necessary, select "General" in the sidebar.
Click the "Background Color" drop-down menu to choose from a list of predefined colors, or choose "More Colors..." to define a custom background color.