I'm having some troubles with missing command.
When I go to Customize>Commands>All Commands I can't find Hide/Show command on that list. I have been playing with accelerator options and I wanted to change something again, but I can't find it anywhere.
I must say that I'm non familiar with deleting a setting, but in this case I don't need it.
Anyway, I've made a stupid mistake. I've been searching Show/Hide command instead of Hide/Show. A day later I figured it out.