When your settings are set to not show ignored tags, you see something like this at the bottom:
Hiding questions because of your Ignored Tags preferences for tags:
However, the page linked to doesn't have my "Ignored Tags preferences" nor anything to do with tags at all. The options are: "Keyboard shortcuts", "Navigation", "Custom Question Lists" (on SO, MSO, MSE), "Advertisements" (with Reduce Ads privilege), "Personalized predictions".
It should lead somewhere I can change my ignored tags preferences (currently the only place where this can be done is the sidebar).