For more, see Project Settings
To activate: File menu / Settings
Configure the GeoSync map view background color. White is the default backcolor.
To use:
Open Settings dialog.
On the General tab, locate the Map Backcolor field.
The default backcolor is white. To change the backcolor, click on the far right side of the field to the right of Map Backcolor.
A triple dot button appears. Select the button.
The color palette appears. Select desired color.
Select OK.