Content Filtering Rules apply in the order they’re listed in School Manager. Where there is a conflict between rules, the first rule always applies, even if there is another rule below it that does something different.
You can click and hold to drag rules around to reorder them.
Locked rules always appear at the top of the list. Locked rules can be reordered against other locked rules, but not moved below rules that aren’t locked.
We go into rule ordering in more detail in our guide to filtering using categories and signatures.