Hi - This spawned as a result of my question,
There's a formatting help page (eg https://meta.stackoverflow.com/editing-help) that says to create a code block, indent everything with 4 spaces.
It presents itself as the formatting guide but does not show shortcuts or mention the toolbar icon for code blocks - personally I never knew about those options until I was compelled to write a question on meta. My guess is there must be others who does the same thing.
Under 'Code and Preformatted Text' section of
editing-help page, add the paragraph, "You can use the shortcut Ctrl+K or code block toolbar icon [image] with a block of text selected to indent it automatically".