To activate a specific layer set in Infurnia, you can 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."
Select the layer set name you want to activate from the list of available layer sets.
Alternatively:
In the Layersets panel on the left, click on the settings icon against the drop-down menu.
Choose "Define" from the options provided.
In the popup that opens, click on the name of the layer set you wish to activate from the list on the left.
By following these steps, you can easily activate a specific layer set in your Infurnia design project, allowing you to work with the layers associated with that set.