I have been using blender for years now, but still learned some useful shortcuts thanks to this. this is a great way to teach shortcuts, and is perfect for a quick reference on a second monitor.
I might suggest a compact view as an option to try to fit more on screen at once, or just increasing the density.
There already is a "collapse" button if you bring up the menu top right (maybe its too subtle?). Default browser zoom out (Ctrl -) should also work fine, so you can see all shortcuts at once, e.g. on a second monitor or on a beamer, if you're teaching a group of people.
Yep. German here, just realised this is another english word we use completely inapproprately, same as "handy" (mobile phone) and "public viewing" (public screening). Sorry for butchering your language.
I might suggest a compact view as an option to try to fit more on screen at once, or just increasing the density.