Unity Addressables MergeMode Behavior Explained

Addressables.MergeMode determines how results from multiple key queries are combined.

• UseFirst: Uses only the results from the first key. Example: [1,2,4]
• Union: Takes the set union of all key results. Example: [1,2,3,4,5]
• Intersection: Uses only elements common to all key results. Example: [4]

In short, Intersection is the set intersection and Union is the set union — straightforward set theory applied to asset queries.