Fishing Boats can also garrison units like most other ships. However, this cannot be done by selecting the unit and right-clicking the Fishing Boat; instead, the player must click the “Garrison inside a building or ship” button and then left-click the Fishing Boat. There is also no “Un-garrison all” button, so the player must un-garrison each unit separately.
there is for hotkey you can set
the button should be at the bottom i think as well