How to set hero skill keys in DOTA2 same as DOTA1?

Enter the settings of DOTA2, in the hero skill settings in the skill options, there is a DotA key option in the upper right corner, after selecting the hero skill key settings will become darker and impossible to set, and the shortcut keys will be the same as the hero shortcut keys of DOTA1.

It should be noted that after selecting the DotA keystroke, the default shortcuts for neutral creature skills and messengers will also become dota1 shortcuts.

Also in the skill options you can set item use shortcuts, formation shortcuts, unit action shortcuts, view action shortcuts, store shortcuts, chat shortcuts, and player view shortcuts.