In the Applications Usage manual section 4.2 -Vim mode ( https://lilypond.org/doc/v2.25/Documentation/usage/vim-mode) the additions to .vimrc do not turn on the plugin: Please add the line
*filetype plugin on * this makes my .vimrc read: *filetype offset runtimepath+=/usr/share/lilypond/2.22.1/vim/filetype onfiletype plugin onsyntax on* (I'm using Ubuntu 22.04 with lilypond from the default repository on apt.) the first line could then be altered removing the word "three" to read: *... To enable all of these features, create (or modify) your $HOME/.vimrc to contain these lines, in order:* This would have saved me some time after a recent reinstall! Hope this is helpful, Philip