To delete a layer set in Infurnia, follow these steps:
Open Infurnia and access 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 delete.
Click on the bin icon that appears next to the layer set's name.
Confirm the deletion when prompted in the popup.
By following these steps, you can delete a layer set from your Infurnia design project. Please note that deleting a layer set will remove all associated layers and their contents, so exercise caution when doing this.