You can press Command-Shift-. (period) to toggle hidden files. This isn’t very discoverable, though.
You can also hold Option while stopping a folder to get an additional Merge button, but at least one folder needs to have unique items.
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You can also hold Option while stopping a folder to get an additional Merge button, but at least one folder needs to have unique items.
[1] https://developer.apple.com/documentation/usernotifications/...