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C-h kis not so useful.C-h kand clicking on the buffer name in the mode-line, I get a*Help*screen with two key sequences described: one is themouse-drag-mode-linefromglobal-mapas above; the other ismode-line-previous-bufferwhich also identifies themode-line-buffer-identification-keymapas described in @lawlist's answer. I'm on GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.13, cairo version 1.16.0).