Sometime I wanted to use a function, but it could be hard finding this function through toolbars and menus. It could be with writer, calc or impress. In Microsoft Office there is the "search command" feature, which is a one line text input box in the UI, there I could write some keywords, and it gives a pull-down menu of candidate actions, then by clicking on one of the candidate actions, I could apply some formatting, insert an object, or open a config dialog. The feature was reported[1]. It could be nice to have something analogous in LibreOffice. And there is the execute-extended-command in emacs, usually bound to M-x, which prompts for a command int the minibuffer, then executes that command after hitting return. execute-extended-command accepts exact command names. Many other softwares also have some similar concept.

[1] "Search command find function in Microsoft Office", by pcworld.com: https://web.archive.org/web/20191129043042/https://www.pcworld.com/article/214068/search_commands.html