Enables merging of multiple chests into one entity. Supports merging of arbitrary number of chests (configurable in mod settings).
Mods introducing new content into the game.
More than just chests.
Is this a common thing? How do I unlock it?
It should appear in tool shortcuts (left of item shortcuts). If you want to have it as item in blueprint menu, there is a "Chest merging tool only available as shortcut" mod setting for that.