AOE IV - How do I “reset” binding unit selection?

AOE IV - How do I “reset” binding unit selection?

I’ve try simply just clicking Ctrl + 1, or 2, 3 ou 4 to reset, but insted of that, they add a number, don’t substitute the number… So I’ve ended with a large number as shortcut/hotkey. Anyone knows how to “reset” this shortcut/hotkey?

Look the print: