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Here is one more complete description of fuses and relays.
Fuse box diagram Nissan Frontier 2005 - 2021 relay with assignment and location
Perhaps it will be useful as well.

These diagrams are not correct for the 2020-2021 Frontiers. Both of these model years have the 3rd Gen drivetrain. Which means they also have 3rd Gen IPDM and relay boxes. They're completely different from older Gen-2's in both layout and fuse numbering.

Although the 2020-2021 Frontiers have the same IPDM layout, the fuse numbers are different in the 2022 (and later?) Frontiers. More info in the files at this post.