To duplicate a layer set in Infurnia, follow these steps:
Open Infurnia and go to your design project.
In the Layersets panel on the left, click on the drop-down menu under "Active layer set."
Hover over the name of the layer set you want to duplicate.
Click on the copy icon (usually represented as two overlapping sheets of paper) against the name of the layer set.
In the popup that opens, you'll see a field where you can enter the desired name for your new layer set.
Enter the new name for the duplicate layer set.
Click "Copy."
By following these steps, you can duplicate a layer set in Infurnia, allowing you to create variations or backups of your existing layer sets to use in your design project.