AND logic when selcting several attribute values - Magento 2 Layered Navigation Filter with Multi Select

Hi there,

I have installed the extension Magento 2 Layered Navigation Filter with Multi Select and created an attribute with several options:

Let's say a product hast the attribute "without..." and three ingredients (attribute values): A B and C

When using the filter I can now brose and search for products "without A". Now I get all results which matched the filter.

Now comes the problem: When I also want to filter out ingredient B, I can also select "without B". The requested filter would show:
- Products with neither A nur B (aka AND logic)

Instead, it shows:
- Products without A OR without B (aka OR logic)

How can I change this? Is there a setting to switch?

Thanks in advance & kind regards,

Jonathan