First, make sure that you have installed and activated the add-on.
Then, in the layer you wish to edit, change the “Layer type” to “Multiple choice”.
Once this is done, you can save. The user can now select several choices on that layer.
It is possible to limit the number of items selected with the “Maximum items selected” setting.
You can then select whether to deselect a previous item if the maximum was already reached.
Include in the total maximum items selected
The setting “Include in the total maximum items” will use a set maximum for the whole product.
This maximum can either use the default number which can be entered in Settings > Product Configurator, or use the value which you can set in a mkl_pc_max_items custom field: