You can follow the steps below to open and use the project you are working on with black background template colors.
When you click the ideCAD icon, click the New command from the list that opens .
Open a new project by double-clicking the color template (black background template) you want to use.
When you click the ideCAD icon, click the Open command from the drop-down list .
The load project dialog will open.
Activate by checking the Apply current pen and color option under the preview window in the dialog .
Select your project and click the Open button.
When your project is opened, the pen and color settings will be changed with the template settings you selected.