Hi,
It depends on the expectations. By default, the plugin will treat unchecked taxonomy checkboxes as exclusions, and the rest must match – however categories, that are not present in the filter are not affected. Posts that are not associated with a category are also not affected.
You can change all of these under the Frontend Search Settings ->Advanced option panel: https://i.imgur.com/aXIa179.png
I highlighted the two main options, that you should try experimenting with. Try changing them, and then use the preview window to so how it’s different, one configuration will definitely work as you expecting it to.
