Took me a bit to find this, but you can click on a line number in multi-buffer to open that file at that location. I think their default assumption is for you to not use the mouse much.
If you're using vim mode g+[space] will open the file where your cursor is. I think it's alt+return in normal mode but either way there's a shortcut hint on the right side of the header for the file your cursor is currently in.
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