buffers-menu-buffer-name-lengthbuffers-menu-buffer-name-length is a variable defined in `
menu-bar.el'. Its value is
30Documentation: Maximum length of the buffer name on the Buffers menu. If this is a number, then buffer names are truncated to this length. If this is nil, then buffer names are shown in full. A large number or nil makes the menu too wide. You can customize this variable.