Hi,
Yes, I did log-in just now. As I suggested earlier, the best option in your case is this. With this, you will strictly get the results only matching the checklist.
I understand what you need, but for that, the “Dietary” and “Courses” should be separate taxonomies – but they are not, so it is not going to work that way.
For example, I check “Gluten Free” + “Dessert” + “Salad” – you expect to see Gluten Free desserts and gluten free salads, that is a valid expectation. However because these are in the same taxonomy (group), there is no way to separate the “Dietary” and the “Courses” categories, to compare the child terms logic individually. The selections are treated as selections from a single group – so the logic applies to them as a whole.
Because of this, there is no way to tell that “Gluten Free” is a must + either “Dessert” or “Salad”, becuse these are a single group.
For this to work that way, the Dietary and the Courses need to be separate taxonomies.