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.
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.
But MacOS keyboard shortcuts have always been undiscoverable unless they were part of the menu, which is a problem.