Favorite Tags

In Configuration, you can set five tags as your favorites. They'll appear in the archive index as shortcut buttons, which you can toggle to instantly perform a search for said tag. Toggling multiple buttons at once is an OR operation, not an AND -- Selecting jojo and touhou will give you archives containing one or both of those tags.

If you do want AND searches in your favorites, you can do so using a quick regex: jojo.*touhou for instance, will only search for archives containing both those tags.