As a tip for macOS users who maybe don’t know this: Theres a similar feature in every macOS app when you click the “Help” menubar entry of an app and enter text into the search field there.
I don’t really use this as a command palette, but it’s so good for finding specific bits of functionality in an app.
It’s also one of the reasons I’m a big fan of global menubars: they act as a sort of index of everything an app can do, and the menubar is always present anyway there’s no point in devs not utilizing them.