Ah, thanks! It'd be really helpful for this to be made clearer in-game (I might be wrong but I think the tutorial never mentioned it?) and maybe having key bindings. "I" seems a weird choice - usually for something like this you'd expect it to be Tab or some other special key (or conventions like "M" for map).
Keybindings are in the works! They used to be in as part of a config window Unity had built in, but they sneakily removed that in one version or another so I'm having to implement my own solution.
I thought I mentioned that in the tutorial, I'll go back and check - I should also mention the tutorial can be re-enabled through the settings screen.